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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
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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

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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