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Loans, Held for Investment - Schedule of Loan Receivable Statistics (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Mortgage Loans on Real Estate [Abstract]    
Number of loans | loan 52 45
Principal balance $ 3,302,130 $ 2,720,344
Total loans, held for investment, net 3,278,334 2,693,092
Unfunded loan commitments $ 119,813 $ 170,365
Weighted-average cash coupon 8.55% 8.88%
London Interbank Offered Rate (LIBOR) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Basis spread on variable rate 1.22% 0.77%