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Fair Value of Financial Instruments - Reconciliation of All Assets and Liabilities Measured Using Level 3 Input (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Level 3    
Purchases, issuances and settlements:    
Net interest income including cash received and paid $ 8,100 $ 8,900
Securitized mortgage borrowings    
Changes in fair value of liabilities during the period    
Fair value in the beginning of the period (2,086,557) (2,619,210)
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (182,378) 14,060
Purchases, issuances and settlements:    
Settlements 654,073 518,593
Fair value at the end of the period (1,614,862) (2,086,557)
Unrealized gains (losses) still held 2,318,296 2,500,674
Securitized mortgage borrowings | Interest expense    
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (37,090) (65,421)
Securitized mortgage borrowings | Change in fair value    
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (145,288) 79,481
Long-term debt    
Changes in fair value of assets during the period    
Fair value at the beginning of the period (44,413)  
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (2,123)  
Purchases, issuances and settlements    
Fair value at the end of the period (46,536) (44,413)
Unrealized gains (losses) still held 15,464  
Changes in fair value of liabilities during the period    
Fair value in the beginning of the period (44,413) (45,434)
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings   1,021
Purchases, issuances and settlements:    
Fair value at the end of the period   (44,413)
Unrealized gains (losses) still held   17,587
Long-term debt | Interest expense    
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (1,499)  
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings   (850)
Long-term debt | Change in fair value    
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings 2,098  
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings   1,899
Long-term debt | Change in instrument specific credit risk    
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (2,722)  
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (2) (28)
Securitized mortgage collateral    
Changes in fair value of assets during the period    
Fair value at the beginning of the period 2,100,175 2,628,064
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings 139,597 (91,815)
Purchases, issuances and settlements    
Settlements (600,521) (436,074)
Fair value at the end of the period 1,639,251 2,100,175
Unrealized gains (losses) still held (104,299) (275,818)
Securitized mortgage collateral | Interest income    
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (12,162) 747
Securitized mortgage collateral | Change in fair value    
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings 151,759 (92,562)
Mortgage servicing rights (3)    
Changes in fair value of assets during the period    
Fair value at the beginning of the period 339 41,470
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (126) (21,962)
Purchases, issuances and settlements    
Issuances 536 2,094
Settlements   (21,263)
Fair value at the end of the period 749 339
Unrealized gains (losses) still held 749 339
Mortgage servicing rights (3) | Change in fair value    
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (126) (21,962)
Interest rate lock commitments (IRLCs)    
Changes in fair value of assets during the period    
Fair value at the beginning of the period 7,275 7,791
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings (4,164) (516)
Purchases, issuances and settlements    
Fair value at the end of the period 3,111 7,275
Unrealized gains (losses) still held 3,111 7,275
Interest rate lock commitments (IRLCs) | Change in fair value    
Total (losses) gains included in earnings:    
Total (losses) gains included in earnings $ (4,164) $ (516)