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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Debt securities (gains) losses, net $ (4,327) $ (10,767) $ (1,923)
Income tax expense (benefit) 61,324 29,147 52,150
Interest income (expense) (596,400) (596,094) (604,273)
Salaries and employee benefits 284,098 293,590 289,452
Net income (277,538) (226,409) (238,206)
Amount Reclassified from AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income 6,631 12,262 184
Amount Reclassified from AOCI | Unrealized Gains and Losses on Available- for-Sale Debt Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Debt securities (gains) losses, net 4,327 10,767 (1,923)
Income tax expense (benefit) (990) (2,375) 438
Net income 3,337 8,392 (1,485)
Amount Reclassified from AOCI | Unrealized Gains and Losses on Held-to- Maturity Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) 0 0 (716)
Interest income (expense) 0 0 2,812
Net income 0 0 2,096
Amount Reclassified from AOCI | Gains and Losses on Cash Flow Hedges | Interest Rate Contract [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) (1,131) (1,267) 147
Interest income (expense) 4,605 5,153 (596)
Net income 3,474 3,886 (449)
Amount Reclassified from AOCI | Defined Benefit Pension Plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense (benefit) 59 5 (8)
Salaries and employee benefits (239) (21) 30
Net income $ (180) $ (16) $ 22