Other Comprehensive Income (Loss) (Components Of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Unrealized (loss) gain on investment securities:
Unrealized (loss) gain on investment securities, Before-Tax Amount	$ (21,016)	$ (2,066)	$ (59,796)	$ (4,995)
Unrealized (loss) gain on investment securities, Income Tax (Provision) Benefit	5,435	536	15,477	1,298
Unrealized (loss) gain on investment securities, Net-of-Tax Amount	(15,581)	(1,530)	(44,319)	(3,697)
Defined benefit pension plan adjustments:
Amortization of prior service cost, Before-Tax Amount	8	7	24	23
Amortization of prior service cost, Income Tax (Provision) Benefit	(2)	(2)	(8)	(7)
Amortization of prior service cost, Net-of-Tax Amount	6	5	16	16
Amortization of actuarial loss, Before-Tax Amount	68	95	203	285
Amortization of actuarial loss, Income Tax (Provision) Benefit	(18)	(25)	(53)	(75)
Amortization of actuarial loss, Net-of-Tax Amount	50	70	150	210
Net change, Before-Tax Amount	76	102	227	308
Net change, Income Tax (Provision) Benefit	(20)	(27)	(61)	(82)
Total	56	75	166	226
Other comprehensive (loss) income, Before-Tax Amount	(20,940)	(1,964)	(59,569)	(4,687)
Other comprehensive (loss) income, Income Tax (Provision) Benefit	5,415	509	15,416	1,216
OTHER COMPREHENSIVE (LOSS) INCOME , NET OF TAX:	$ (15,525)	$ (1,455)	$ (44,153)	$ (3,471)