Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 5,877	$ 6,820	$ 6,135
Other comprehensive income (loss), net of tax:
Change in fair value of securities available for sale, net of tax, $(567), $(586), and $43, respectively	2,133	2,204	(161)
Reclassification adjustment for gain on securities available for sale, net of tax, $208, $17, and $176, respectively	(784)	(62)	(662)
Change in fair value of interest rate swap, net of tax, $72, $66, and $(36), respectively	(271)	(250)	135
Change in unrecognized benefit obligation for Supplemental Executive Retirement Plan, net of tax, $33, $(4) and $(4), respectively	(124)	17	15
Total other comprehensive income (loss), net of tax, $(254), $(507), and $179, respectively	954	1,909	(673)
Total comprehensive income	$ 6,831	$ 8,729	$ 5,462