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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2013	Nov. 07, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Entity Registrant Name	Cherry Hill Mortgage Investment Corporation
Entity Central Index Key	0001571776
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		7,500,000

Consolidated Balance Sheet - USD ($)	Sep. 30, 2013	Dec. 31, 2012
Assets
Cash	$ 14,826	$ 1,000
Total Assets	14,826	1,000
Liabilities
Due to Cherry Hill Mortgage Management, LLC	41,135
Accrued expenses	105,000	25,000
Total Liabilities	146,135	25,000
Stockholder's Deficit
Common stock, $0.01 par value, 500,000,000 shares authorized at September 30, 2013 and 1,000 shares authorized at December 31, 2012, 1,000 shares issued and outstanding	10	10
Preferred stock, $0.01 par value, 100,000,000 shares authorized at September 30, 2013 and no shares authorized at December 31, 2012, no shares issued and outstanding
Additional paid-in capital	990	990
Deficit accumulated during the development stage	(132,309)	(25,000)
Total Stockholder's Deficit	(131,309)	(24,000)
Total Liabilities & Equity	$ 14,826	$ 1,000

Consolidated Balance Sheet (Parenthetical) - $ / shares	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	1,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Consolidated Statements of Operations - USD ($)	3 Months Ended	9 Months Ended	11 Months Ended
Consolidated Statements of Operations - USD ($)	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
Income Statement [Abstract]
Audit fees	$ 35,000	$ 105,000	$ 130,000
Administrative expenses	1,054	2,309	2,309
Total expenses	36,054	107,309	132,309
Net loss	$ 36,054	$ 107,309	$ 132,309

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Consolidated Statements of Stockholder's Deficit - 9 months ended Sep. 30, 2013 - USD ($)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Deficit Accumulated During the Development Stage [Member]
Beginning balance (date of inception) at Dec. 31, 2012	$ (24,000)	$ 10	$ 990	$ (25,000)
Balance balance (date of inception), Shares at Dec. 31, 2012	1,000	1,000
Net loss	$ (107,309)			(107,309)
Ending balance at Sep. 30, 2013	$ (131,309)	$ 10	$ 990	$ (132,309)
Ending balance, Shares at Sep. 30, 2013	1,000	1,000

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Consolidated Statements of Cash Flows - USD ($)	2 Months Ended	3 Months Ended	9 Months Ended	11 Months Ended
Consolidated Statements of Cash Flows - USD ($)	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
Cash flows from operating activities
Net loss	$ (25,000)	$ (36,054)	$ (107,309)	$ (132,309)
Net cash provided (used) in operating activities:
Increase in accrued expenses			80,000	105,000
Net cash used in operating activities			(27,309)	(27,309)
Cash flows from financing activities
Increase in Due to affiliate			41,135	41,135
Proceeds from issuance of common shares to founder				1,000
Net cash provided by financing activities			41,135	42,135
Net increase (decrease) in cash			13,826	14,826
Cash beginning of period			1,000
Cash end of period	$ 1,000	$ 14,826	$ 14,826	$ 14,826

Organization and Basis of Presentation	9 Months Ended
Organization and Basis of Presentation	Sep. 30, 2013
Accounting Policies [Abstract]
Organization and Basis of Presentation	1. Organization and Basis of Presentation Cherry Hill Mortgage Investment Corporation (together with its consolidated subsidiaries, the “Company”) was organized in the state of Maryland on October 31, 2012 to invest in residential mortgage assets in the United States. Under the Company’s charter, the Company was authorized at December 31, 2012 to issue 1,000 shares of common stock. On June 6, 2013, the Company amended and restated its charter and increased its authorized capitalization. Accordingly, at September 30, 2013, the Company was authorized to issue up to 500,000,000 shares of common stock and 100,000,000 shares of preferred stock, each with a par value of $0.01 per share. The Company commenced operations on or about October 9, 2013. The accompanying condensed consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates. The accompanying condensed consolidated financial statements include the accounts of the Company’s subsidiaries, Cherry Hill Operating Partnership LP, Cherry Hill QRS I, LLC, Cherry Hill QRS II, LLC and Cherry Hill TRS, LLC. Significant intercompany accounts and transactions have been eliminated. In the opinion of management, all adjustments, consisting solely of normal recurring accruals, necessary for the fair presentation of financial statements for the interim periods have been included. The current period’s results of operations are not necessarily indicative of results that ultimately may be achieved for the year.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Initial Public Offering and Concurrent Private Placement	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]
Initial Public Offering and Concurrent Private Placement	2. Initial Public Offering and Concurrent Private Placement On October 9, 2013, the Company completed an initial public offering (the “IPO”) of 6,500,000 shares of common stock and a concurrent private placement of 1,000,000 shares of common stock. The IPO and concurrent private placement resulted in the sale of 7,500,000 shares of common stock, at a price per share of $20.00. The net proceeds to the Company from the IPO and the concurrent private placement were approximately $148 million, after deducting offering-related expenses payable by the Company. The Company did not conduct any activity prior to the IPO and the concurrent private placement. Substantially all of the net proceeds from the IPO are intended to be used to invest in excess mortgage servicing rights on residential mortgage loans (“Excess MSRs”) and Agency residential mortgage-backed securities (“RMBS”). The Company is subject to the risks involved with real estate and real estate-related debt instruments. These include, among others, the risks normally associated with changes in the general economic climate, changes in the mortgage market, changes in tax laws, interest rate levels, and the availability of financing. Prior to the IPO, the sole stockholder of the Company was Stanley Middleman. On December 4, 2012, Mr. Middleman made a $1,000 initial capital contribution to the Company in exchange for 1,000 shares of common stock, and, on October 9, 2013, the Company repurchased these shares from Mr. Middleman for $1,000. The Company is managed by Cherry Hill Mortgage Management, LLC (the “Manager”), a Delaware limited liability company which is controlled by Mr. Middleman. The Company was taxed for U.S. federal income tax purposes as a Subchapter C corporation for the two month period from October 31, 2012 (date of inception) to December 31, 2012. On February 13, 2013, the Company elected to be taxed for U.S. federal income tax purposes as a Subchapter S corporation effective January 1, 2013, and, as such, all federal tax liabilities were the responsibility of the sole stockholder. In anticipation of the IPO, the Company elected to revoke its Subchapter S election on October 2, 2013. The Company will elect and intends to qualify as a REIT for U.S. federal income tax purposes for its short taxable year ending December 31, 2013.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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+ Details

Significant Accounting Policies	9 Months Ended
Significant Accounting Policies	Sep. 30, 2013
Accounting Policies [Abstract]
Significant Accounting Policies	3. Significant Accounting Policies Use of estimates The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the balance sheet, in addition to the reported amount revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant estimates include the valuation allowance on deferred tax assets. Offering costs Offering costs incurred in connection with the Company’s IPO will be reflected as a reduction of additional paid-in-capital. Costs incurred that are not directly associated with the completion of the IPO will be expensed as incurred. As of September 30, 2013, the Manager had incurred approximately $1.6 million of costs relating to the IPO. Offering costs incurred in connection with the IPO included, among others, the fees and disbursements of the Company’s counsel, the costs of printing the prospectus for the IPO, the fees paid to apply to list the Company’s common stock and all filing fees paid in connection with the IPO. However, the Manager agreed to pay the underwriting discounts and commissions and the structuring fee, without reimbursement from the Company. Cash and cash Equivalents Cash and cash equivalents consist of unrestricted demand deposits and highly liquid investments with original maturities of three months or less. Cash and cash equivalents are carried at cost which approximates fair value.

Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2013
Related Party Transactions [Abstract]
Related Party Transactions	4. Related Party Transactions The Company has entered into a management agreement with the Manager, pursuant to which the Manager provides for the day-to-day management of the Company’s operations (the “Management Agreement”). The Management Agreement requires the Manager to manage the Company’s business affairs in conformity with the policies and the investment guidelines that are approved and monitored by the Company’s Board of Directors. All of the Company’s executive officers and the officers and employees of the Manager are also officers or employees of Freedom Mortgage Corporation (“Freedom Mortgage”). The Manager is a party to a services agreement with Freedom Mortgage, pursuant to which Freedom Mortgage provides to the Manager the personnel, services and resources as needed by the Manager to enable the Manager to carry out its obligations and responsibilities under the Management Agreement (the “Services Agreement”). The Company is a named third-party beneficiary to the Services Agreement and, as a result, has, as a non-exclusive remedy, a direct right of action against Freedom Mortgage in the event of any breach by the Manager of any of its duties, obligations or agreements under the Management Agreement that arise out of or result from any breach by Freedom Mortgage of its obligations under the Services Agreement. The Services Agreement will terminate upon the termination of the Management Agreement. Pursuant to the Services Agreement, the Manager will make certain payments to Freedom Mortgage in connection with the services provided. Refer to Note 7 (Subsequent Events) for more information regarding related party transactions.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References + Details

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	6. Income Taxes For the period October 31, 2012 (date of inception) through December 31, 2012, the Company was taxable as a corporation, and as such, was subject to federal, state and local taxation. The Company incurred certain expenses during the period but had not commenced operations. The Company recorded a deferred tax asset of $10 thousand related to these start up expenses. Given that the Company is in its first year of operations and is not expected to realize the benefits of the deferred tax asset, management concluded that a full valuation allowance is required. On January 1, 2013, the Company elected to be taxed as a Subchapter S corporation and as such all federal tax liabilities are the responsibility of the Company’s sole stockholder. The Company had no state and local income tax liability for the period that it was taxed as a Subchapter S corporation. On October 2, 2013, the Company elected to revoke its Subchapter S election.

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2013
Subsequent Events [Abstract]
Subsequent Events	7. Subsequent Events On October 9, 2013, the Company entered into the Strategic Alliance Agreement with Freedom Mortgage, to benefit from having a consistent and predictable source of real estate assets from Freedom Mortgage. On October 9, 2013, the Company also entered into the Flow and Bulk Excess MSR Acquisition Agreement with Freedom Mortgage, pursuant to which Freedom Mortgage agrees to offer to the Company, and the Company, at its option, may agree to acquire, interests in excess mortgage servicing rights on single family, residential mortgage loans that Freedom Mortgage originates through one of its channels or acquires in bulk from third parties. On October 9, 2013, the Company also entered into the Pool 1 Excess MSR Acquisition and Recapture Agreement (“Pool 1 Agreement”) with Freedom Mortgage, to acquire Excess MSRs. Under the Pool 1 Agreement, the Company committed to invest approximately $60.6 million to acquire an 85% participation interest in the Excess MSRs related to a pool of predominantly fixed rate, Ginnie Mae-eligible FHA and VA mortgage loans originated by Freedom Mortgage. On October 9, 2013, the Company also entered into the Pool 2 Excess MSR Acquisition and Recapture Agreement (“Pool 2 Agreement”) with Freedom Mortgage, to acquire Excess MSRs. Under the Pool 2 Agreement, the Company committed to invest approximately $38.4 million to acquire a 50% participation interest in the Excess MSRs related to a pool of Ginnie Mae-eligible VA hybrid adjustable rate mortgages (“ARMs”) originated by a third party seller. As of November 5, 2013, the Company had acquired approximately $299 million of Agency RMBS, backed by whole pools of 30-year, 20-year and 15-year fixed rate mortgages, and approximately $24 million of forward-settling Agency RMBS where the pool is “to-be-announced” (“TBA”). As of November 5, 2013, the Company had an aggregate of approximately $261 million of short-term borrowings under master repurchase agreements with seven counterparties to finance the acquisition of these Agency RMBS. These borrowings are secured by cash collateral and a portion of the Company’s Agency RMBS and bear interest at rates that have historically moved in close relationship to LIBOR.

Significant Accounting Policies (Policies)	9 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2013
Accounting Policies [Abstract]
Use of Estimates	Use of estimates The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the balance sheet, in addition to the reported amount revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant estimates include the valuation allowance on deferred tax assets.
Offering Costs	Offering costs Offering costs incurred in connection with the Company’s IPO will be reflected as a reduction of additional paid-in-capital. Costs incurred that are not directly associated with the completion of the IPO will be expensed as incurred. As of September 30, 2013, the Manager had incurred approximately $1.6 million of costs relating to the IPO. Offering costs incurred in connection with the IPO included, among others, the fees and disbursements of the Company’s counsel, the costs of printing the prospectus for the IPO, the fees paid to apply to list the Company’s common stock and all filing fees paid in connection with the IPO. However, the Manager agreed to pay the underwriting discounts and commissions and the structuring fee, without reimbursement from the Company.
Cash and Cash Equivalents	Cash and cash Equivalents Cash and cash equivalents consist of unrestricted demand deposits and highly liquid investments with original maturities of three months or less. Cash and cash equivalents are carried at cost which approximates fair value.

- Definition

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

+ References + Details

Organization and Basis of Presentation - Additional Information (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Common stock, shares authorized	500,000,000	1,000
Preferred stock, shares authorized	100,000,000	0
Common stock, par value	$ 0.01	$ 0.01
Preferred stock, par value	$ 0.01	$ 0.01
Date of commencement of operations	Oct. 09, 2013

Initial Public Offering and Concurrent Private Placement - Additional Information (Detail) - USD ($)			2 Months Ended	9 Months Ended
	Oct. 09, 2013	Dec. 04, 2012	Dec. 31, 2012	Sep. 30, 2013
Equity [Line Items]
Net proceeds from IPO and concurrent private placement			$ 1,000
Date of conducting IPO and concurrent private placement of common stock				Oct. 04, 2013
Stanley Middleman [Member]
Equity [Line Items]
Common stock issued, shares		1,000
Initial capital contribution by sole stockholder to the company		$ 1,000
Subsequent Event [Member]
Equity [Line Items]
Common stock issued, shares	7,500,000
Common stock issued through initial public offering and concurrent private placement, price per share	$ 20.00
Net proceeds from IPO and concurrent private placement	$ 148,000,000
Subsequent Event [Member] \| Initial Public Offering [Member]
Equity [Line Items]
Common stock issued, shares	6,500,000
Subsequent Event [Member] \| Private Placement [Member]
Equity [Line Items]
Common stock issued, shares	1,000,000
Subsequent Event [Member] \| Stanley Middleman [Member]
Equity [Line Items]
Amount of repurchased shares	$ 1,000

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] $ in Millions	Nov. 05, 2013 USD ($) Securities	Oct. 09, 2013 USD ($)
Subsequent Event [Line Items]
Number of real estate securities under repurchase agreement \| Securities	7
Residential Mortgage-backed Securities [Member]
Subsequent Event [Line Items]
Acquired securities	$ 299.0
Amount used to finance the investments in Agency RMBS	261.0
Forward Settling Residential Mortgage-backed Securities [Member]
Subsequent Event [Line Items]
Acquired securities	$ 24.0
Pool 1 Agreement [Member]
Subsequent Event [Line Items]
Commitment to invest in excess MSRs		$ 60.6
Percentage of participation interest under commitment to invest in excess MSRs		85.00%
Fixed rate mortgage period	30 years
Pool 2 Agreement [Member]
Subsequent Event [Line Items]
Commitment to invest in excess MSRs		$ 38.4
Percentage of participation interest under commitment to invest in excess MSRs		50.00%
Fixed rate mortgage period	20 years
Pool 3 Agreement [Member]
Subsequent Event [Line Items]
Fixed rate mortgage period	15 years

Label	Element	Value
Retained Earnings [Member]
Net Income Loss	us-gaap_NetIncomeLoss	$ (25,000)
Additional Paid In Capital [Member]
Stock Issued During Period Value New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	$ 990
Common Stock [Member]
Stock Issued During Period Shares New Issues	us-gaap_StockIssuedDuringPeriodSharesNewIssues	1,000
Stock Issued During Period Value New Issues	us-gaap_StockIssuedDuringPeriodValueNewIssues	$ 10

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Indirect Expenses	9 Months Ended
Indirect Expenses	Sep. 30, 2013
Other Income And Expenses [Abstract]
Indirect Expenses	5. Indirect Expenses From October 31, 2012 (date of inception) to December 31, 2012, and for the nine months ended September 30, 2013, the Company shared office space with Freedom Mortgage. In accordance with the Management Agreement between the Company and the Manager, the Manager has not allocated rent, overhead, reimbursable executives’ salaries, and other miscellaneous office expenses to the Company, as it had not commenced operations as of September 30, 2013 and had not generated revenue during the period. The Manager will commence allocating expenses to the Company in October 2013, the first month during which the Company commences operations subsequent to the completion of the IPO and the concurrent private placement. The Company monitors and maintains a separate record of such expenses. For the nine month period ending September 30, 2013 and for the cumulative period from October 31, 2012 (date of inception) to September 30, 2013, such expenses amounted to approximately $800 thousand and approximately $840 thousand, respectively. The Manager has adequate resources independent of the Company to pay these expenses, and the Company has no additional obligation, either direct or indirect, to compensate any party for these expenses.

Significant Accounting Policies - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2013 USD ($)
Accounting Policies [Abstract]
Expenses related to IPO incurred by the Manager	$ 1.6

Indirect Expenses - Additional Information (Detail) $ in Thousands	9 Months Ended	11 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2013 USD ($)
Other Income And Expenses [Abstract]
Rent, overhead, reimbursable executives' salaries, and other miscellaneous office expenses not allocated to the Company	$ 800	$ 840
Additional obligation of the Company for indirect expenses	$ 0	$ 0

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Deferred tax assets related to start up expenses	$ 10
S Corporation [Member]
Income Taxes [Line Items]
State and local income tax liability		$ 0