Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 709	$ 402	$ 2,327	$ 2,041
Net change in unrealized gains (losses) on available-for-sale securities :
Unrealized gains (losses)	24	(5)	354	(179)
Income tax effect	(5)	1	(75)	(8)
Unrealized gains (losses) on securities, net of tax	19	(4)	279	(187)
Pension benefit liability adjustment:
Net (loss)	(32)	(31)	(115)	(96)
Income tax effect	7	11	24	33
Pension liability adjustment, net of tax	(25)	(20)	(91)	(63)
Total other comprehensive income (loss), net of tax	(6)	(24)	188	(250)
Total comprehensive income	$ 703	$ 378	$ 2,515	$ 1,791