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Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]    
Net income $ 120,284 $ 146,600
Change in debt securities available-for-sale:    
Unrealized holding gains (losses) for the period (44,709) 24,724
Reclassification adjustment for securities (gains) losses realized in income 16 5,216
Income tax effect 11,242 1,146
Unrealized gains (losses) on available-for-sale securities (33,451) 31,086
Change in securities held-to-maturity:    
Amortization of unrealized losses on securities transferred     from available-for-sale 4,318 5,829
Income tax effect (1,097) (131)
Changes from securities held-to-maturity 3,221 5,698
Change in hedges:    
Net unrealized derivative gains (losses) on hedges (19,159) 47,849
Reclassification adjustment for (gains) losses realized in net income 4,877 7,292
Income tax effect 3,693 (13,720)
Changes from hedges (10,589) 41,421
Change in defined benefit pension plans:    
Amortization of net (gains) losses recognized in income 0 (188)
Income tax effect 0 47
Changes from defined benefit pension plans 0 (141)
Other comprehensive income (loss), net of tax (40,819) 78,064
Comprehensive income (loss) $ 79,465 $ 224,664