Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 23,751	$ 18,864	$ 12,315
Other Comprehensive Income (Loss)
Net unrealized holding gain (loss) on securities available for sale	14,878	(2,912)	3,112
Reclassification adjustment for realized gains included in net income	(1,014)	(804)	(708)
Net unrealized loss related to defined benefit plan	(215)	(109)	(20)
Other comprehensive income (loss), before tax, total	13,649	(3,825)	2,384
Income tax benefit (expense) related to other comprehensive income	(2,875)	820	(749)
Other comprehensive income (loss), net of tax	10,774	(3,005)	1,635
Comprehensive Income	$ 34,525	$ 15,859	$ 13,950