Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Gain (Loss) on Securities	$ 562	$ 2,247	$ 4,081
Income Tax Expense	(17,351)	(18,648)	(12,834)
Net Income	81,825	84,137	62,210
Salaries and Employee Benefits	(84,145)	(68,570)	(68,112)
Total Reclassifications for the Period	390	1,775
Unrealized Gains and Losses on Available-for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total Reclassifications for the Period	444	1,775
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total Reclassifications for the Period	444	1,775	3,224
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available-for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Gain (Loss) on Securities	562	2,247	4,081
Income Tax Expense	(118)	(472)	(857)
Net Income	444	1,775	3,224
Reclassification out of Accumulated Other Comprehensive Income | Amortization of Post Retirement Plan Items Actuarial Gains (Losses) | Postretirement Medical and Life Benefit Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense	0	0	0
Net Income	0	0	0
Salaries and Employee Benefits	$ 0	$ 0	$ 0