Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,124	$ 96	$ 1,687	$ 904
Net change in unrealized gains on securities available-for-sale:
Unrealized gains	115	270	24	815
Income tax effect	(39)	(92)	(9)	(277)
Unrealized gains on securities, net	76	178	15	538
Pension benefit liability adjustment:
Net loss during the period			(31)
Income tax effect			11
Pension liability adjustment, net of tax			(20)
Total other comprehensive income (loss), net of tax	76	178	(5)	538
Total comprehensive income	$ 1,200	$ 274	$ 1,682	$ 1,442