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Fair Value of Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
ABS Issued  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 $ 6,900,362
Acquisitions 147,086
Principal paydowns (494,234)
Gains (losses) in net income (loss), net (77,742)
Other settlements, net 0
Ending balance - March 31, 2021 6,475,472
Residential Loans  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 4,249,014
Acquisitions 3,146,682
Originations 0
Sales (2,348,126)
Principal paydowns (369,393)
Gains (losses) in net income (loss), net 24,898
Unrealized losses in OCI, net 0
Other settlements, net (1,275)
Ending balance - March 31, 2021 4,701,800
Business purpose loans  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 4,136,353
Acquisitions 0
Originations 386,327
Sales (8,877)
Principal paydowns (282,289)
Gains (losses) in net income (loss), net (45,987)
Unrealized losses in OCI, net 0
Other settlements, net (13,407)
Ending balance - March 31, 2021 4,172,120
Multifamily loans  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 492,221
Acquisitions 0
Originations 0
Sales 0
Principal paydowns (1,946)
Gains (losses) in net income (loss), net (730)
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance - March 31, 2021 489,545
Trading securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 125,667
Acquisitions 22,429
Originations 0
Sales (23,546)
Principal paydowns (509)
Gains (losses) in net income (loss), net 21,349
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance - March 31, 2021 145,390
AFS Securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 218,458
Acquisitions 1,078
Originations 0
Sales (2,200)
Principal paydowns (11,238)
Gains (losses) in net income (loss), net 4,596
Unrealized losses in OCI, net 8,236
Other settlements, net 0
Ending balance - March 31, 2021 218,930
Servicer Advance Investments  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 231,489
Acquisitions 0
Originations 0
Sales 0
Principal paydowns (24,804)
Gains (losses) in net income (loss), net (160)
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance - March 31, 2021 206,525
MSRs  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 8,815
Acquisitions 0
Originations 0
Sales 0
Principal paydowns 0
Gains (losses) in net income (loss), net (870)
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance - March 31, 2021 7,945
Excess MSRs  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 34,418
Acquisitions 0
Originations 0
Sales 0
Principal paydowns 0
Gains (losses) in net income (loss), net (1,953)
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance - March 31, 2021 32,465
Shared Home Appreciation Options  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 42,440
Acquisitions 0
Originations 0
Sales 0
Principal paydowns (1,932)
Gains (losses) in net income (loss), net 5,315
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance - March 31, 2021 45,823
Derivatives  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance - December 31, 2020 14,450
Acquisitions 0
Principal paydowns 0
Gains (losses) in net income (loss), net (52,761)
Other settlements, net 4,369
Ending balance - March 31, 2021 $ (33,942)