Statements Of Consolidated Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statements Of Consolidated Comprehensive Income [Abstract]
NET INCOME		$ 3,791	$ 2,618	$ 7,110	$ 5,764
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX:
Unrealized (loss) gain on available-for-sale securities		(684)	3	(2,044)	190
Defined benefit pension plans:
Amortization of prior service cost	[1]	5	5	11	15
Amortization of actuarial loss	[1]	31	26	67	79
Net change, Net-of-Tax Amount		36	31	78	94
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX		(648)	34	(1,966)	284
COMPREHENSIVE INCOME		$ 3,143	$ 2,652	$ 5,144	$ 6,048

[1] Included in net periodic pension cost, as described in Note 9 - "Net Periodic Benefit Costs"