CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning of Period at Dec. 31, 2018	$ 182,262	$ 9,484	$ 130,133	$ 45,721	$ (3,076)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued in acquisition	18,637	764	17,873
Surrendered shares	(280)	(11)	(269)
Options exercised	170	12	158
Dividends declared	(1,682)			(1,682)
Stock-based compensation	1,056	41	1,015
Shares repurchased	(8,326)	(360)	(7,966)
Net income	13,508			13,508
Other comprehensive income (loss), net	5,112				5,112
End of Period at Sep. 30, 2019	210,457	9,930	140,944	57,547	2,036
Beginning of Period at Jun. 30, 2019	205,499	9,938	140,856	53,492	1,213
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Surrendered shares	(7)		(7)
Options exercised	142	10	132
Dividends declared	(602)			(602)
Stock-based compensation	374	1	373
Shares repurchased	(429)	(19)	(410)
Net income	4,657			4,657
Other comprehensive income (loss), net	823				823
End of Period at Sep. 30, 2019	210,457	9,930	140,944	57,547	2,036
Beginning of Period at Dec. 31, 2019	241,976	11,229	168,658	60,198	1,891
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issuance costs	(45)		(45)
Surrendered shares	(313)	(15)	(298)
Options exercised	46	3	43
Dividends declared	(2,011)			(2,011)
Stock-based compensation	1,256	54	1,202
Shares repurchased	(10,791)	(641)	(10,150)
Net income	9,349			9,349
Other comprehensive income (loss), net	(2,200)				(2,200)
End of Period at Sep. 30, 2020	237,267	10,630	159,410	67,536	(309)
Beginning of Period at Jun. 30, 2020	236,706	10,840	161,729	63,767	370
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Surrendered shares	(5)		(5)
Dividends declared	(698)			(698)
Stock-based compensation	424	2	422
Shares repurchased	(2,948)	(212)	(2,736)
Net income	4,467			4,467
Other comprehensive income (loss), net	(679)				(679)
End of Period at Sep. 30, 2020	$ 237,267	$ 10,630	$ 159,410	$ 67,536	$ (309)