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Shareholders' Equity - AOCI Reclass to IS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Income Tax Benefit (Expense) $ (55,914) $ (64,830) $ (72,182)
Net Income 171,202 225,804 253,372
Salaries and Benefits (234,079) (235,270) (228,293)
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Net Income (23,492) (9,267) 528
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Unrealized Gains(Losses) of Investment Securities Transferred from AFS to HTM      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Interest Income (26,909) (10,680) (648)
Income Tax Benefit (Expense) 7,133 2,831 171
Net Income (19,776) (7,849) (477)
Reclassification out of Accumulated Other Comprehensive Income | Sales of Investment Securities Available-for-Sale      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Income Tax Benefit (Expense) 1,237   (1,007)
Net Income (3,345)   2,791
Sales of Investment Securities Available-for-Sale (4,582)   3,798
Reclassification out of Accumulated Other Comprehensive Income | Prior Service Credit      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Salaries and Benefits 246 246 246
Reclassification out of Accumulated Other Comprehensive Income | Net Actuarial Losses      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Salaries and Benefits (751) (2,175) (2,676)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Defined Benefit Plans Items      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Income Tax Benefit (Expense) 134 511 644
Net Income (371) (1,418) (1,786)
Salaries and Benefits $ (505) $ (1,929) $ (2,430)