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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, 2018
Dec. 31, 2017
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Loans held for investment, at fair value $ 5,307,560 $ 4,715,831
Other financing liabilities 719,319 593,518
Residential Mortgage-Backed Securitization Trusts [Member]    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Loans held for investment, at fair value 28,373 0
Other financing liabilities $ 26,643 $ 0