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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
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Cash and cash equivalents, at carrying value $ 86,824 $ 108,619 $ 67,994 $ 21,568
Restricted cash, at carrying value 15,794       
Commercial first mortgage loans, at carrying value 160,893 142,921    
Subordinate loans, at carrying value 394,554 246,246    
Repurchase agreements, at carrying value    6,598    
Borrowings under repurchase agreements, at carrying value (227,167) (225,158)    
Cash and cash equivalents, estimated fair value 86,824 108,619    
Restricted cash, estimated fair value 15,794       
Commercial first mortgage loans, estimated fair value 165,063 150,144    
Repurchase agreements, estimated fair value    6,598    
Borrowings under repurchase agreements, estimated fair value (227,175) (225,158)    
Commercial Real Estate [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subordinate loans, estimated fair value $ 400,099 $ 250,520