Statements Of Consolidated Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Statements Of Consolidated Comprehensive Income [Abstract]
NET INCOME		$ 3,146	$ 1,714
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Unrealized gain on available-for-sale securities		187	649
Defined benefit pension plans:
Amortization of prior service cost	[1]	10	5
Amortization of actuarial loss	[1]	53	35
Net change, Net-of-Tax Amount		63	40
OTHER COMPREHENSIVE INCOME, NET OF TAX		250	689
COMPREHENSIVE INCOME		$ 3,396	$ 2,403

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