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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Jan. 01, 2020
Assets:        
REO assets as a percent of consolidated VIE assets 1.00%      
Loans as a percent of consolidated VIE assets 99.00%      
Fair Value Measurements        
Permitted reinvestment under static investment in VIEs $ 0      
Retained Earnings (Accumulated Deficit). $ (654,750)   $ (629,733)  
ASU 2016-13 | Reclassification Adjustment        
Credit Losses        
Allowance for credit losses       $ 32,300
ASU 2020-06 | Cumulative Effect, Period of Adoption, Adjustment        
Fair Value Measurements        
Additional paid-in capital   $ (3,700)    
Retained Earnings (Accumulated Deficit).   $ (2,200)