Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2017	$ 85,583	$ 977	$ 17,881	$ (4,397)	$ 100,044
Balance (in shares) at Dec. 31, 2017	11,630,129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			12,551		12,551
Other comprehensive income (loss), net of tax				(639)	(639)
Stock dividend adjustment	$ 240		(240)		0
Stock dividend adjustment (in shares)	628
Stock dividend declared	$ 6,280		(6,280)		0
Stock dividend declared (in shares)	583,514
Cash in lieu of fractional shares			(10)		(10)
Cash in lieu of fractional shares (in shares)	(159)
Stock-based compensation	$ 424				424
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals	$ 91				91
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals (in shares)	33,722
Stock options exercised, net	$ 0				0
Stock options exercised, net (in shares)	5,978
Balance at Dec. 31, 2018	$ 92,618	977	23,902	(5,036)	112,461
Balance (in shares) at Dec. 31, 2018	12,253,812
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			14,721		14,721
Other comprehensive income (loss), net of tax				5,170	5,170
Stock dividend adjustment	$ 330		(330)		0
Stock dividend adjustment (in shares)	1,401
Stock dividend declared	$ 6,668		(6,668)		0
Stock dividend declared (in shares)	615,196
Cash in lieu of fractional shares			(8)		(8)
Cash in lieu of fractional shares (in shares)	(116)
Stock-based compensation	$ 475				475
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals	$ 96				96
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals (in shares)	48,839
Balance at Dec. 31, 2019	$ 100,187	977	31,617	134	132,915
Balance (in shares) at Dec. 31, 2019	12,919,132
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			12,161		12,161
Other comprehensive income (loss), net of tax				4,904	4,904
Stock dividend adjustment	$ 348		(348)		0
Stock dividend adjustment (in shares)	1,310
Stock dividend declared	$ 6,307		(6,307)		0
Stock dividend declared (in shares)	649,260
Cash in lieu of fractional shares			(8)		(8)
Cash in lieu of fractional shares (in shares)	(166)
Stock-based compensation	$ 574				574
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals	$ 111				111
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals (in shares)	51,993
Stock options exercised, net	$ 0				0
Stock options exercised, net (in shares)	12,934
Balance at Dec. 31, 2020	$ 107,527	$ 977	$ 37,115	$ 5,038	$ 150,657
Balance (in shares) at Dec. 31, 2020	13,634,463