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Fair Value of Financial Instruments - Reconciliation of All Assets and Liabilities Measured Using Level 3 Input (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Purchases, issuances and settlements:        
Net interest income including cash received and paid   $ 2,100 $ 1,200 $ 4,300
Recurring basis | Securitized mortgage borrowings | Level 3        
Changes in fair value of liabilities during the period        
Fair value in the beginning of the period   (2,028,210) (1,614,862) (2,086,557)
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings   (8,187) $ (7,564) (103,248)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Interest Expense, amount  
Purchases, issuances and settlements:        
Settlements   189,173 $ 1,622,426 342,581
Fair value at the end of the period   (1,847,224)   (1,847,224)
Unrealized gains (losses) still held       2,397,426
Recurring basis | Securitized mortgage borrowings | Interest expense | Level 3        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings   (8,909)   (18,018)
Recurring basis | Securitized mortgage borrowings | Change in fair value | Level 3        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings   722   (85,230)
Recurring basis | Long-term debt | Level 3        
Changes in fair value of liabilities during the period        
Fair value in the beginning of the period $ (47,549) (45,361) (46,536) (44,413)
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings 11,660 461 10,647 (487)
Purchases, issuances and settlements:        
Fair value at the end of the period (35,889) (44,900) (35,889) (44,900)
Unrealized gains (losses) still held     26,111 17,100
Recurring basis | Long-term debt | Interest expense | Level 3        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings (357) (418) (743) (724)
Recurring basis | Long-term debt | Change in fair value | Level 3        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings 1,980 1,417 3,622 2,442
Recurring basis | Long-term debt | Change in instrument specific credit risk | Level 3        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings 10,037 (538) 7,768 (2,205)
Recurring basis | Securitized mortgage collateral | Level 3        
Changes in fair value of assets during the period        
Fair value at the beginning of the period   2,038,545 1,639,251 2,100,175
Total (losses) gains included in earnings:        
Total (losses) gains included in earnings   (7,272) 11,267 70,378
Purchases, issuances and settlements        
Settlements   (172,850) (1,650,518) (312,130)
Fair value at the end of the period   1,858,423   1,858,423
Unrealized gains (losses) still held       (186,507)
Recurring basis | Securitized mortgage collateral | Interest income | Level 3        
Total (losses) gains included in earnings:        
Total (losses) gains included in earnings   (4,722) 2,019 (9,479)
Recurring basis | Securitized mortgage collateral | Change in fair value | Level 3        
Total (losses) gains included in earnings:        
Total (losses) gains included in earnings   (2,550) 9,248 79,857
Recurring basis | Mortgage servicing rights | Level 3        
Changes in fair value of assets during the period        
Fair value at the beginning of the period 856 498 749 339
Total (losses) gains included in earnings:        
Total (losses) gains included in earnings $ (6) $ (37) $ 55 $ 1
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Trust Assets, Net Change in Fair Value Including Real Estate Owned, Gain (Loss) Trust Assets, Net Change in Fair Value Including Real Estate Owned, Gain (Loss) Trust Assets, Net Change in Fair Value Including Real Estate Owned, Gain (Loss) Trust Assets, Net Change in Fair Value Including Real Estate Owned, Gain (Loss)
Purchases, issuances and settlements        
Issuances   $ 92 $ 46 $ 213
Fair value at the end of the period $ 850 553 850 553
Unrealized gains (losses) still held     850 553
Recurring basis | Interest rate lock commitments (IRLCs) | Level 3        
Changes in fair value of assets during the period        
Fair value at the beginning of the period 846 5,078 3,111 7,275
Total (losses) gains included in earnings:        
Total (losses) gains included in earnings $ (348) $ (816) $ (2,613) $ (3,013)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Trust Assets, Net Change in Fair Value Including Real Estate Owned, Gain (Loss) Trust Assets, Net Change in Fair Value Including Real Estate Owned, Gain (Loss) Trust Assets, Net Change in Fair Value Including Real Estate Owned, Gain (Loss) Trust Assets, Net Change in Fair Value Including Real Estate Owned, Gain (Loss)
Purchases, issuances and settlements        
Fair value at the end of the period $ 498 $ 4,262 $ 498 $ 4,262
Unrealized gains (losses) still held     $ 498 $ 4,262