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Subsequent Events (Detail) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended	1 Months Ended				1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Oct. 28, 2014 Subsequent Event [Member]	Oct. 31, 2014 Deutsche Bank AG [Member] Subsequent Event [Member]	Apr. 30, 2014 Line of Credit [Member] Deutsche Bank AG [Member]	Sep. 30, 2014 Line of Credit [Member] Amended DB Facility [Member] Deutsche Bank AG [Member]	Oct. 01, 2014 Line of Credit [Member] Amended DB Facility [Member] Deutsche Bank AG [Member] Subsequent Event [Member]	Oct. 31, 2014 Commercial Mortgage Backed Securities [Member] Subsequent Event [Member]
Stock Transactions, Parenthetical Disclosures [Abstract]
Dividend declared per share of common stock	$ 0.40	$ 0.40	$ 1.2	$ 1.2	$ 0.40
Maximum borrowing under facility							$ 100,000,000	$ 275,000,000	$ 300,000,000
Mortgage Loans on Real Estate [Abstract]
Equity deployed to acquire CMBS										4,657,000
Aggregate purchase price of CMBS										23,283,000
Borrowings under term repurchase						$ 18,626,000
Weighted Average Life										3 years
Internal rate of return										15.00%

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Available-for-sale Debt Securities, Weighted Average Expected Term

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Publisher FASB

-Name Accounting Standards Codification

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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-Name Accounting Standards Codification

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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