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Loans, Held for Investment - Schedule of Mortgage Loans Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, held for investment, net $ 3,558,600 $ 2,693,092
Commercial Mortgage Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, held for investment, net 2,218,222 1,641,856
Subordinate Mortgage Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans, held for investment, net $ 1,340,378 $ 1,051,236