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, 2017	$ 91,480	$ 67,926	$ 5,280	$ 18,624	$ (350)
Beginning balance, shares at Dec. 31, 2017		13,190,527
Net income	3,216			3,216
Stock issued under stock offering, net of expenses	22,637	$ 22,637
Stock issued under stock offering, net of expenses, shares		2,300,000
Stock issued under stock-based compensation plans	114	$ 114
Stock issued under stock-based compensation plans, shares		40,000
Stock-based compensation	246		246
Change in unrealized loss on securities available for sale net of reclassifications and tax effects	(433)				(433)
Ending balance at Mar. 31, 2018	117,260	$ 90,677	5,526	21,840	(783)
Ending balance, shares at Mar. 31, 2018		15,530,527
Beginning balance at Dec. 31, 2017	91,480	$ 67,926	5,280	18,624	(350)
Beginning balance, shares at Dec. 31, 2017		13,190,527
Net income	10,489
Ending balance at Sep. 30, 2018	124,975	$ 91,009	5,887	29,112	(1,033)
Ending balance, shares at Sep. 30, 2018		15,770,576
Beginning balance at Mar. 31, 2018	117,260	$ 90,677	5,526	21,840	(783)
Beginning balance, shares at Mar. 31, 2018		15,530,527
Net income	3,791			3,791
Stock issued under stock offering, net of expenses	(64)	$ (64)
Stock issued under stock-based compensation plans	281	$ 281
Stock issued under stock-based compensation plans, shares		98,688
Stock-based compensation	194		194
Change in unrealized loss on securities available for sale net of reclassifications and tax effects	(69)				(69)
Ending balance at Jun. 30, 2018	121,393	$ 90,894	5,720	25,631	(852)
Ending balance, shares at Jun. 30, 2018		15,629,215
Net income	3,481			3,481
Stock issued under stock offering, net of expenses	(4)	$ (4)
Stock issued under stock-based compensation plans	119	$ 119
Stock issued under stock-based compensation plans, shares		141,361
Stock-based compensation	167		167
Change in unrealized loss on securities available for sale net of reclassifications and tax effects	(181)				(181)
Ending balance at Sep. 30, 2018	124,975	$ 91,009	5,887	29,112	(1,033)
Ending balance, shares at Sep. 30, 2018		15,770,576
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 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 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 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