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Shareholders' Equity - AOCI Reclass to IS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Provision for Income Tax $ (72,182) $ (35,320) $ (59,913)
Net Income 253,372 153,804 225,913
Salaries and Benefits (228,293) (207,329) (216,106)
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Net Income 528 (1,788) (1,472)
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 (648) (397) (833)
Provision for Income Tax 171 105 221
Net Income (477) (292) (612)
Reclassification out of Accumulated Other Comprehensive Income | Sales of Investment Securities Available-for-Sale      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Provision for Income Tax (1,007) (50) (49)
Net Income 2,791 27 103
Sales of Investment Securities Available-for-Sale 3,798 77 152
Reclassification out of Accumulated Other Comprehensive Income | Prior Service Credit      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Salaries and Benefits 246 246 288
Reclassification out of Accumulated Other Comprehensive Income | Net Actuarial Losses      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Salaries and Benefits (2,676) (2,318) (1,598)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Defined Benefit Plans Items      
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]      
Provision for Income Tax 644 549 347
Net Income (1,786) (1,523) (963)
Salaries and Benefits $ (2,430) $ (2,072) $ (1,310)