Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Unrealized loss on investment securities:
Unrealized loss on investment securities, Before-Tax Amount	$ (11,904)	$ (21,016)	$ (12,822)	$ (59,796)
Unrealized loss on investment securities, Income Tax (Provision) Benefit	3,091	5,435	3,350	15,477
Unrealized loss on investment securities, Net-of-Tax Amount	(8,813)	(15,581)	(9,472)	(44,319)
Defined benefit pension plan adjustments:
Amortization of prior service cost, Before-Tax Amount		8		24
Amortization of prior service cost, Income Tax (Provision) Benefit		(2)		(8)
Amortization of prior service cost, Net-of-Tax Amount		6		16
Amortization of actuarial loss, Before-Tax Amount	27	68	81	203
Amortization of actuarial loss, Income Tax (Provision) Benefit	(7)	(18)	(21)	(53)
Amortization of actuarial loss, Net-of-Tax Amount	20	50	60	150
Net change, Before-Tax Amount	27	76	81	227
Net change, Income Tax (Provision) Benefit	(7)	(20)	(21)	(61)
Total	20	56	60	166
Other comprehensive (loss) income, Before-Tax Amount	(11,877)	(20,940)	(12,741)	(59,569)
Other comprehensive (loss) income, Income Tax (Provision) Benefit	3,084	5,415	3,329	15,416
OTHER COMPREHENSIVE LOSS , NET OF TAX:	$ (8,793)	$ (15,525)	$ (9,412)	$ (44,153)