CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 7,430	$ 10,027	$ 9,433
Other comprehensive income (loss):
Unrealized holding gains (losses) on securities available for sale	2,523	(6,352)	(2,472)
Reclassification adjustment gains realized in net income	(109)	(987)	(372)
Net unrealized gains (losses)	2,414	(7,339)	(2,844)
Tax effect	(904)	2,773	1,094
Net of tax amount	1,510	(4,566)	(1,750)
Change in funded status of defined benefit pension plan and other benefit plans:
Net gain (loss) arising during the period	1,001	5,369	(2,052)
Reclassification adjustment for amortization of prior service costs	(220)	(427)	(90)
Prior service credit	0	1,101	0
Reclassification adjustment for amortization of net actuarial loss	413	1,595	1,484
Total before tax effect	1,194	7,638	(658)
Tax effect	(453)	(2,884)	251
Net of tax amount	741	4,754	(407)
Total other comprehensive income (loss)	2,251	188	(2,157)
Comprehensive income	$ 9,681	$ 10,215	$ 7,276