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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
Mar. 31, 2019
Dec. 31, 2018
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Loans held for investment, at fair value $ 5,753,154 $ 5,498,719
Other financing liabilities 1,043,698 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 26,237 26,520
Other financing liabilities $ 24,562 $ 24,815