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Use of Special Purpose Entities and Variable Interest Entities (Loan Securitization Transaction) (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
May 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]      
Outstanding amount of Senior Bonds at June 30, 2018   $ 96,794,000 $ 96,773,000
Asset-backed Securities, Securitized Loans and Receivables      
Variable Interest Entity [Line Items]      
Aggregate fair value $ 319,100,000 $ 942,285,000 $ 620,924,000
Weighted average interest rate   3.40% 3.14%
Cash received   $ 566,815,000 $ 382,845,000
Outstanding amount of Senior Bonds at June 30, 2018   518,655,000 363,944,000
Debt issuance cost   2,900,000 2,300,000
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables      
Variable Interest Entity [Line Items]      
Principal amount of Securitized debt   566,817,000 382,847,000
Proceeds from Senior bond sold with Step up feature   399,600,000 $ 233,700,000
Debt instrument, basis spread on variable rate     300.00%
Debt instrument, coupon step-up period     36 months
Rated and Non-Rated Certificates | Asset-backed Securities, Securitized Loans and Receivables      
Variable Interest Entity [Line Items]      
Principal amount of Securitized debt   $ 173,431,000 $ 127,001,000
Trust, Ownership in Residential Whole Loans | Asset-backed Securities, Securitized Loans and Receivables      
Variable Interest Entity [Line Items]      
Cash received 184,000,000    
Trust, Ownership in Residential Whole Loans | Senior Notes | Asset-backed Securities, Securitized Loans and Receivables      
Variable Interest Entity [Line Items]      
Principal amount of Securitized debt $ 183,970,000    
Weighted average interest rate 3.875%    
Trust, Ownership in Residential Whole Loans | Non Rated Certificates | Asset-backed Securities, Securitized Loans and Receivables      
Variable Interest Entity [Line Items]      
Principal amount of Securitized debt $ 46,400,000