Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Unrealized gain (loss) on investment securities:
Unrealized gain (loss) on investment securities, Before-Tax Amount	$ 3,875		$ (1,756)	$ (826)
Unrealized gain (loss) on investment securities, Income Tax (Provision) Benefit	(1,005)		457	319
Unrealized gain (loss) on investment securities, Net-of-Tax Amount	2,870		(1,299)	(507)
Unrealized (loss) gain on investment securities, Tax effect reclass due to TCJA				(177)
Unrealized (loss) gain on investment securities, Total Net Change				(684)
Defined benefit pension plan adjustments:
Net actuarial (loss) gain, Before-Tax Amount	(581)		(987)	(30)
Net actuarial gain (loss), Income Tax (Provision) Benefit	212		196	11
Net actuarial gain (loss), Net-of-Tax Amount	(369)		(791)	(19)
Amortization of prior service cost, Before-Tax Amount	32	[1]	31	31	[1]
Amortization of prior service cost, Income Tax (Provision) Benefit	(9)	[1]	(5)	(4)	[1]
Amortization of prior service cost, Net-of-Tax Amount	23	[1]	26	27	[1]
Amortization of actuarial loss, Before-Tax Amount	332	[1]	169	173	[1]
Amortization of actuarial loss, Income Tax (Provision) Benefit	(86)	[1]	(41)	(36)	[1]
Amortization of actuarial loss, Net-of-Tax Amount	246	[1]	128	137	[1]
Net change, Before-Tax Amount	(217)		(787)	174
Net change, Income Tax (Provision) Benefit	117		150	(29)
Net change, Net-of-Tax Amount	(100)		(637)	145
Net change, Tax effect reclass due to TCJA				(454)
Net change, Total Net Change				(309)
Other comprehensive (loss) income, Before-Tax Amount	3,658		(2,543)	(652)
Other comprehensive (loss) income, Income Tax (Provision) Benefit	(888)		607	290
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	2,770		(1,936)	(362)
Other Comprehensive Income (Loss), Tax effect reclass due to TCJA				(631)
Other Comprehensive Income (Loss), Total Net Change	$ 2,770		$ (1,936)	$ (993)

[1] Included in net periodic pension cost as described in Note 11 - "Employee Benefits and Deferred Compensation Plans"