Other Comprehensive Income (Components Of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Unrealized gain on investment securities:
Unrealized gain on investment securities, Before-Tax Amount	$ 1,603	$ 1,984	$ 4,078	$ 3,746
Unrealized gain on investment securities, Income Tax (Provision) Benefit	(415)	(513)	(1,055)	(972)
Unrealized gain on investment securities, Net-of-Tax Amount	1,188	1,471	3,023	2,774
Defined benefit pension plan adjustments:
Amortization of prior service cost, Before-Tax Amount	8	8	16	16
Amortization of prior service cost, Income Tax (Provision) Benefit	(2)	(3)	(5)	(5)
Amortization of prior service cost, Net-of-Tax Amount	6	5	11	11
Amortization of actuarial loss, Before-Tax Amount	113	83	226	166
Amortization of actuarial loss, Income Tax (Provision) Benefit	(29)	(21)	(60)	(43)
Amortization of actuarial loss, Net-of-Tax Amount	84	62	166	123
Net change, Before-Tax Amount	121	91	242	182
Net change, Income Tax (Provision) Benefit	(31)	(24)	(65)	(48)
Total, Net-of-Tax	90	67	177	134
Other comprehensive income (loss), Before-Tax Amount	1,724	2,075	4,320	3,928
Other comprehensive income (loss), Income Tax (Provision) Benefit	(446)	(537)	(1,120)	(1,020)
OTHER COMPREHENSIVE INCOME, NET OF TAX	$ 1,278	$ 1,538	$ 3,200	$ 2,908