Shareholders' Equity - AOCI Reclass to IS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Benefit (Expense)	$ (64,830)	$ (72,182)	$ (35,320)
Net Income	225,804	253,372	153,804
Salaries and Benefits	(235,270)	(228,293)	(207,329)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net Income	(9,267)	528	(1,788)
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	(10,680)	(648)	(397)
Income Tax Benefit (Expense)	2,831	171	105
Net Income	(7,849)	(477)	(292)
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)		(1,007)	(50)
Net Income		2,791	27
Sales of Investment Securities Available-for-Sale		3,798	77
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	(2,175)	(2,676)	(2,318)
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)	511	644	549
Net Income	(1,418)	(1,786)	(1,523)
Salaries and Benefits	$ (1,929)	$ (2,430)	$ (2,072)