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Securitizations and Variable Interest Entities - Schedule of Carrying Value of Assets and Liabilities of Consolidated Mortgage-backed Securitization Trusts (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Loans held for investment, at fair value $ 6,073,687 $ 5,498,719
Other financing liabilities 1,069,594 1,127,613
Residential Mortgage Backed Securitization Trusts [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Loans held for investment, at fair value 24,445 26,520
Other financing liabilities $ 22,827 $ 24,815