Statements Of Consolidated Comprehensive Income - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Statements Of Consolidated Comprehensive Income [Abstract]
NET INCOME	$ 2,618		$ 2,003		$ 5,764		$ 3,717
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Unrealized gain on available-for-sale securities	3		260		190		909
Defined benefit pension plans:
Amortization of prior service cost	5	[1]	5	[1]	15	[2]	10	[2]
Amortization of actuarial loss	26	[1]	35	[1]	79	[2]	70	[2]
Net change, Net-of-Tax Amount	31		40		94		80
OTHER COMPREHENSIVE INCOME, NET OF TAX	34		300		284		989
COMPREHENSIVE INCOME	$ 2,652		$ 2,303		$ 6,048		$ 4,706

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

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