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Shareholders' Equity - AOCI Reclass to IS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Income Tax Benefit (Expense) $ (47,857) $ (55,914) $ (64,830)
Net Income 149,994 171,202 225,804
Other Noninterest Expense 57,865 58,656 62,715
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Net Income (18,932) (23,492) (9,267)
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 (24,844) (26,909) (10,680)
Income Tax Benefit (Expense) 6,586 7,133 2,831
Net Income (18,258) (19,776) (7,849)
Reclassification out of Accumulated Other Comprehensive Income | Sales of Investment Securities Available-for-Sale      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Sales of Investment Securities Available-for-Sale   (4,582)  
Income Tax Benefit (Expense)   1,237  
Net Income   (3,345)  
Reclassification out of Accumulated Other Comprehensive Income | Prior Service Credit      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Other Noninterest Expense 246 246 246
Reclassification out of Accumulated Other Comprehensive Income | Net Actuarial Losses      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Other Noninterest Expense (1,163) (751) (2,175)
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) 243 134 511
Net Income (674) (371) (1,418)
Other Noninterest Expense $ (917) $ (505) $ (1,929)