Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 6,135	$ 2,496	$ 3,674
Other comprehensive income (loss), net of tax:
Change in fair value of securities available for sale, net of tax, $43, $(384), and $277, respectively	(161)	735	(536)
Reclassification adjustment for gain on securities available for sale, net of tax, $176, $0, and $0, respectively	(662)
Change in fair value of interest rate swap, net of tax, $(36), $(1), and $(107), respectively	135	14	207
Change in unrecognized benefit obligation for Supplemental Executive Retirement Plan, net of tax, $(4), $(27) and $(26), respectively	15	92	52
Total other comprehensive income (loss), net of tax, $179, $(412), and $144, respectively	(673)	841	(277)
Total comprehensive income	$ 5,462	$ 3,337	$ 3,397