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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Company's Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash and cash equivalents, at carrying value $ 156,797 $ 108,619 $ 11,959 $ 21,568
Commercial first mortgage loans, at carrying value 143,492 142,921    
Subordinate loans, at carrying value 354,865 246,246    
Repurchase agreements, at carrying value    6,598    
Borrowings under repurchase agreements, at carrying value (191,312) (225,158)    
Cash and cash equivalents, estimated fair value 156,797 108,619    
Commercial first mortgage loans, estimated fair value 149,281 150,144    
Repurchase agreements, estimated fair value    6,598    
Borrowings under repurchase agreements, estimated fair value (191,312) (225,158)    
Commercial Real Estate [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subordinate loans, estimated fair value $ 359,670 $ 250,520