Other Comprehensive Income (Components Of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Unrealized gain (loss) on investment securities:
Unrealized gain (loss) on investment securities, Before-Tax Amount	$ (455)	$ 705	$ 3,623	$ 4,493
Unrealized gain (loss) on investment securities, Income Tax (Provision) Benefit	116	(182)	(939)	(1,165)
Unrealized gain (loss) on investment securities, Net-of-Tax Amount	(339)	523	2,684	3,328
Reclassification from accumulated other comprehensive income for gain on sale of securities, Before-Tax Amount	(667)		(667)	(42)
Reclassification from accumulated other comprehensive income for gain on sale of securities, Income Tax (Provision) Benefit	173		173	11
Reclassification from accumulated other comprehensive income for gain on sale of securities, Net-of-Tax Amount	(494)		(494)	(31)
Net change, Before-Tax Amount	(1,122)	705	2,956	4,451
Net change, Income Tax (Provision) Benefit	289	(182)	(766)	(1,154)
Net change, Net-of-Tax Amount	(833)	523	2,190	3,297
Defined benefit pension plan adjustments:
Amortization of prior service cost, Before-Tax Amount	7	7	23	23
Amortization of prior service cost, Income Tax (Provision) Benefit	(1)	(1)	(6)	(6)
Amortization of prior service cost, Net-of-Tax Amount	6	6	17	17
Amortization of actuarial loss, Before-Tax Amount	113	82	339	248
Amortization of actuarial loss, Income Tax (Provision) Benefit	(29)	(20)	(89)	(63)
Amortization of actuarial loss, Net-of-Tax Amount	84	62	250	185
Net change, Before-Tax Amount	120	89	362	271
Net change, Income Tax (Provision) Benefit	(30)	(21)	(95)	(69)
Total, Net-of-Tax	90	68	267	202
Other comprehensive income (loss), Before-Tax Amount	(1,002)	794	3,318	4,722
Other comprehensive income (loss), Income Tax (Provision) Benefit	259	(203)	(861)	(1,223)
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX	$ (743)	$ 591	$ 2,457	$ 3,499