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Loans, Held for Investment - Schedule of Loan Receivable Statistics (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Mortgage Loans on Real Estate [Abstract]    
Number of loans | loan 51 45
Principal balance $ 3,179,213 $ 2,720,344
Total loans, held for investment, net 3,151,386 2,693,092
Unfunded loan commitments $ 121,470 $ 170,365
Weighted-average cash coupon 8.82% 8.88%