Comprehensive Income (Loss) (Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unrealized loss on investment securities:
Unrealized (loss) gain on investment securities, Before-Tax Amount		$ (826)	$ (1,355)	$ (719)
Unrealized (loss) gain on investment securities, Income Tax (Provision) Benefit		319	515	283
Unrealized (loss) gain on investment securities, Net-of-Tax Amount		(507)	(840)	(436)
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 plans adjustments:
Net actuarial (loss) gain, Before-Tax Amount		(30)	110	5
Net actuarial gain (loss), Income Tax (Provision) Benefit		11	(42)	(15)
Net actuarial gain (loss), Net-of-Tax Amount		(19)	68	(10)
Amortization of prior service cost, Before-Tax Amount	[1]	31	31	31
Amortization of prior service cost, Income Tax (Provision) Benefit	[1]	(4)	(12)	(12)
Amortization of prior service cost, Net-of-Tax Amount	[1]	27	19	19
Amortization of actuarial loss, Before-Tax Amount	[1]	173	221	201
Amortization of actuarial loss, Income Tax (Provision) Benefit	[1]	(36)	(82)	(76)
Amortization of actuarial loss, Net-of-Tax Amount	[1]	137	139	125
Net change, Before-Tax Amount		174	362	237
Net change, Income Tax (Provision) Benefit		(29)	(136)	(103)
Net change, Net-of-Tax Amount		145	226	134
Net change, Tax effect reclass due to TCJA		(454)
Net change, Total Net Change		(309)
Other Comprehensive Income (Loss), Before-Tax Amount		(652)	(993)	(482)
Other Comprehensive Income (Loss), Income Tax (Provision) Benefit		290	379	180
OTHER COMPREHENSIVE LOSS, NET OF TAX		(362)	$ (614)	$ (302)
Other Comprehensive Income (Loss), Tax effect reclass due to TCJA		(631)
Other Comprehensive Income (Loss), Total Net Change		$ (993)

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