CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2018	$ 129,787	$ 91,209	$ 6,249	$ 32,877	$ (548)
Beginning balance, shares at Dec. 31, 2018		15,860,306
Net income	4,740			4,740
Stock issued under stock-based compensation plans	292	$ 292
Stock issued under stock-based compensation plans, shares		118,162
Stock-based compensation	377		377
Repurchase of common stock	(2,381)	$ (2,381)
Repurchase of common stock, shares		(258,885)
Cash dividends declared	(793)			(793)
Change in unrealized income(loss) on securities available for sale net of reclassifications and tax effects	354				354
Ending balance at Mar. 31, 2019	132,376	$ 89,120	6,626	36,824	(194)
Ending balance, shares at Mar. 31, 2019		15,719,583
Beginning balance at Dec. 31, 2018	129,787	$ 91,209	6,249	32,877	(548)
Beginning balance, shares at Dec. 31, 2018		15,860,306
Net income	12,576
Ending balance at Sep. 30, 2019	137,593	$ 87,085	7,154	43,086	268
Ending balance, shares at Sep. 30, 2019		15,711,580
Beginning balance at Mar. 31, 2019	132,376	$ 89,120	6,626	36,824	(194)
Beginning balance, shares at Mar. 31, 2019		15,719,583
Net income	3,836			3,836
Stock issued under stock-based compensation plans, shares		77,809
Stock-based compensation	339		339
Repurchase of common stock	(665)	$ (665)
Repurchase of common stock, shares		(74,385)
Cash dividends declared	(782)			(782)
Change in unrealized income(loss) on securities available for sale net of reclassifications and tax effects	378				378
Ending balance at Jun. 30, 2019	135,482	$ 88,455	6,965	39,878	184
Ending balance, shares at Jun. 30, 2019		15,723,007
Net income	4,000			4,000
Stock issued under stock-based compensation plans	72	$ 72
Stock issued under stock-based compensation plans, shares		145,190
Stock-based compensation	189		189
Repurchase of common stock	(1,442)	$ (1,442)
Repurchase of common stock, shares		(156,617)
Cash dividends declared	(792)			(792)
Change in unrealized income(loss) on securities available for sale net of reclassifications and tax effects	84				84
Ending balance at Sep. 30, 2019	137,593	$ 87,085	7,154	43,086	268
Ending balance, shares at Sep. 30, 2019		15,711,580
Beginning balance at Dec. 31, 2019	140,576	$ 86,381	7,524	46,483	188
Beginning balance, shares at Dec. 31, 2019		15,703,276
Net income	3,299			3,299
Stock issued under stock-based compensation plans	305	$ 305
Stock issued under stock-based compensation plans, shares		130,046
Stock-based compensation	358		358
Repurchase of common stock	(6,264)	$ (6,264)
Repurchase of common stock, shares		(717,454)
Cash dividends declared	(1,087)			(1,087)
Change in unrealized income(loss) on securities available for sale net of reclassifications and tax effects	912				912
Ending balance at Mar. 31, 2020	138,099	$ 80,422	7,882	48,695	1,100
Ending balance, shares at Mar. 31, 2020		15,115,868
Beginning balance at Dec. 31, 2019	140,576	$ 86,381	7,524	46,483	188
Beginning balance, shares at Dec. 31, 2019		15,703,276
Net income	9,310
Ending balance at Sep. 30, 2020	141,549	$ 79,600	8,382	52,590	977
Ending balance, shares at Sep. 30, 2020		15,126,270
Beginning balance at Mar. 31, 2020	138,099	$ 80,422	7,882	48,695	1,100
Beginning balance, shares at Mar. 31, 2020		15,115,868
Net income	2,416			2,416
Stock issued under stock-based compensation plans, shares		22,189
Stock-based compensation	336		336
Repurchase of common stock	(497)	$ (497)
Repurchase of common stock, shares		(70,027)
Cash dividends declared	(1,055)			(1,055)
Change in unrealized income(loss) on securities available for sale net of reclassifications and tax effects	(163)				(163)
Ending balance at Jun. 30, 2020	139,136	$ 79,925	8,218	50,056	937
Ending balance, shares at Jun. 30, 2020		15,068,030
Net income	3,595			3,595
Stock issued under stock-based compensation plans, shares		116,356
Stock-based compensation	164		164
Repurchase of common stock	(325)	$ (325)
Repurchase of common stock, shares		(58,116)
Cash dividends declared	(1,061)			(1,061)
Change in unrealized income(loss) on securities available for sale net of reclassifications and tax effects	40				40
Ending balance at Sep. 30, 2020	$ 141,549	$ 79,600	$ 8,382	$ 52,590	$ 977
Ending balance, shares at Sep. 30, 2020		15,126,270