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Fair Value of Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Contingent Consideration    
Assets    
Deconsolidations $ 0  
Liabilities    
Beginning balance 28,484 $ 0
Acquisitions 0 25,267
Principal paydowns (13,353) 0
Gains (losses) in net income (loss), net (446) 3,217
Other settlements, net (14,685) 0
Ending Balance 0 28,484
ABS issued    
Assets    
Deconsolidations (3,706,789)  
Liabilities    
Beginning balance 10,515,475 5,410,073
Acquisitions 1,478,589 6,098,462
Principal paydowns (1,487,958) (1,112,437)
Gains (losses) in net income (loss), net 101,045 119,377
Other settlements, net 0 0
Ending Balance 6,900,362 10,515,475
Residential Loans    
Assets    
Beginning balance 7,714,745 7,254,631
Acquisitions 4,483,473 7,092,866
Originations 0 0
Sales (6,262,958) (5,141,886)
Principal paydowns (1,552,171) (1,609,220)
Deconsolidations 0  
Gains (losses) in net income (loss), net (132,307) 119,132
Unrealized losses in OCI, net 0 0
Other settlements, net (1,768) (778)
Ending Balance 4,249,014 7,714,745
Business Purpose Loans    
Assets    
Beginning balance 3,506,743 141,258
Acquisitions 0 2,639,615
Originations 1,431,251 1,015,436
Sales (135,800) (76,909)
Principal paydowns (753,026) (213,655)
Deconsolidations 0  
Gains (losses) in net income (loss), net 99,590 7,423
Unrealized losses in OCI, net 0 0
Other settlements, net (12,405) (6,425)
Ending Balance 4,136,353 3,506,743
Multifamily securities    
Assets    
Beginning balance 4,408,524 2,144,598
Acquisitions 0 2,162,386
Originations 0 0
Sales 0 0
Principal paydowns (7,703) (28,543)
Deconsolidations (3,849,779)  
Gains (losses) in net income (loss), net (58,821) 130,083
Unrealized losses in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 492,221 4,408,524
Trading securities    
Assets    
Beginning balance 860,540 1,118,612
Acquisitions 108,249 332,593
Originations 0 0
Sales (603,529) (597,122)
Principal paydowns (8,687) (44,600)
Deconsolidations 0  
Gains (losses) in net income (loss), net (230,906) 56,008
Unrealized losses in OCI, net 0 0
Other settlements, net 0 (4,951)
Ending Balance 125,667 860,540
AFS Securities    
Assets    
Beginning balance 239,334 333,882
Acquisitions 57,652 26,538
Originations 0 0
Sales (55,192) (110,070)
Principal paydowns (17,924) (39,702)
Deconsolidations 0  
Gains (losses) in net income (loss), net 10,792 24,580
Unrealized losses in OCI, net (16,204) 4,106
Other settlements, net 0 0
Ending Balance 218,458 239,334
Servicer advance investments    
Assets    
Beginning balance 169,204 300,468
Acquisitions 179,419 69,610
Originations 0 0
Sales 0 0
Principal paydowns (107,527) (203,876)
Deconsolidations 0  
Gains (losses) in net income (loss), net (9,607) 3,002
Unrealized losses in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 231,489 169,204
MSRs    
Assets    
Beginning balance 42,224 60,281
Acquisitions 0 868
Originations 0 0
Sales 0 0
Principal paydowns 0 0
Deconsolidations 0  
Gains (losses) in net income (loss), net (33,409) (18,925)
Unrealized losses in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 8,815 42,224
Excess MSRs    
Assets    
Beginning balance 31,814 27,312
Acquisitions 10,906 7,762
Originations 0 0
Sales 0 0
Principal paydowns 0 0
Deconsolidations 0  
Gains (losses) in net income (loss), net (8,302) (3,260)
Unrealized losses in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 34,418 31,814
Shared Home Appreciation Options    
Assets    
Beginning balance 45,085 0
Acquisitions 3,517 44,243
Originations 0 0
Sales 0 0
Principal paydowns (4,278) 0
Deconsolidations 0  
Gains (losses) in net income (loss), net (1,884) 842
Unrealized losses in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 42,440 45,085
Derivatives    
Assets    
Beginning balance 8,860 2,181
Acquisitions 0 0
Principal paydowns 0 0
Deconsolidations 0  
Gains (losses) in net income (loss), net 56,972 62,220
Other settlements, net (51,382) (55,541)
Ending Balance $ 14,450 $ 8,860