Statements Of Consolidated Comprehensive Income - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Statements Of Consolidated Comprehensive Income [Abstract]
NET INCOME	$ 3,723		$ 2,216		$ 9,487		$ 5,933
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Unrealized gain (loss) on available-for-sale securities	(112)		(376)		78		533
Defined benefit pension plans:
Amortization of prior service cost	4	[1]	5	[1]	19	[2]	15	[2]
Amortization of actuarial loss	28	[1]	35	[1]	107	[2]	105	[2]
Net change, Net-of-Tax Amount	32		40		126		120
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(80)		(336)		204		653
COMPREHENSIVE INCOME	$ 3,643		$ 1,880		$ 9,691		$ 6,586

[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"