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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, 2020
Dec. 31, 2019
Level 3    
Purchases, issuances and settlements    
Net interest income including cash received and paid $ 8,900 $ 9,400
Securitized mortgage borrowings    
Changes in fair value of liabilities during the period    
Fair value in the beginning of the period (2,619,210) (3,148,215)
Total gains (losses) included in earnings:    
Total (losses) gains included in earnings 14,060 (94,023)
Purchases, issuances and settlements    
Settlements 518,593 623,028
Fair value at the end of the period (2,086,557) (2,619,210)
Unrealized gains (losses) still held 2,500,674 2,486,615
Securitized mortgage borrowings | Interest Expense    
Total gains (losses) included in earnings:    
Total (losses) gains included in earnings (65,421) (38,127)
Securitized mortgage borrowings | Change in fair value    
Total gains (losses) included in earnings:    
Total (losses) gains included in earnings 79,481 (55,896)
Long-term debt    
Changes in fair value of assets during the period    
Fair value at the beginning of the period (45,434)  
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings 1,021  
Purchases, issuances and settlements    
Fair value at the end of the period (44,413) (45,434)
Unrealized gains (losses) still held 17,587  
Changes in fair value of liabilities during the period    
Fair value in the beginning of the period (45,434) (44,856)
Total gains (losses) included in earnings:    
Total (losses) gains included in earnings   (578)
Purchases, issuances and settlements    
Fair value at the end of the period   (45,434)
Unrealized gains (losses) still held   16,566
Long-term debt | Interest Expense    
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings (850)  
Total gains (losses) included in earnings:    
Total (losses) gains included in earnings   (425)
Long-term debt | Change in fair value    
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings 1,899  
Total gains (losses) included in earnings:    
Total (losses) gains included in earnings   (1,429)
Long-term debt | Change in instrument specific credit risk    
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings (28)  
Total gains (losses) included in earnings:    
Total (losses) gains included in earnings (2) 1,276
Securitized mortgage collateral    
Changes in fair value of assets during the period    
Fair value at the beginning of the period 2,628,064 3,157,071
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings (91,815) 63,778
Purchases, issuances and settlements    
Settlements (436,074) (592,785)
Fair value at the end of the period 2,100,175 2,628,064
Unrealized gains (losses) still held (275,818) (232,469)
Securitized mortgage collateral | Interest Income    
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings 747 11,279
Securitized mortgage collateral | Change in fair value    
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings (92,562) 52,499
Mortgage servicing rights    
Changes in fair value of assets during the period    
Fair value at the beginning of the period 41,470 64,728
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings (21,962) (25,771)
Purchases, issuances and settlements    
Issuances 2,094 2,491
Settlements (21,263) 22
Fair value at the end of the period 339 41,470
Unrealized gains (losses) still held 339 41,470
Mortgage servicing rights | Change in fair value    
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings (21,962) (25,771)
Interest rate lock commitments. net (IRLCs)    
Changes in fair value of assets during the period    
Fair value at the beginning of the period 7,791 3,351
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings (516) 4,440
Purchases, issuances and settlements    
Fair value at the end of the period 7,275 7,791
Unrealized gains (losses) still held 7,275 7,791
Interest rate lock commitments. net (IRLCs) | Change in fair value    
Total gains (losses) included in earnings:    
Total gains (losses) included in earnings $ (516) $ 4,440