CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss, Net [Member]	Total
Balance at Dec. 31, 2016	$ 79,114	$ 977	$ 14,557	$ (2,350)	$ 92,298
Balance (in shares) at Dec. 31, 2016	11,148,446
Net income					5,061
Other comprehensive loss, net of taxes					67
Balance at Jun. 30, 2017				(2,283)
Balance at Dec. 31, 2016	$ 79,114	977	14,557	(2,350)	92,298
Balance (in shares) at Dec. 31, 2016	11,148,446
Net income			8,748		8,748
Other comprehensive loss, net of taxes				(1,448)	(1,448)
Stock dividend adjustment	$ 207		(207)		0
Stock dividend adjustment (in shares)	289
Tax rate change reclassification			599	(599)	0
4% stock dividend declared in 2018	$ 5,806		(5,806)		0
4% stock dividend declared in 2018 (in shares)	447,312
Cash in lieu of fractional shares			(10)		(10)
Cash in lieu of fractional shares (in shares)	(129)
Stock-based compensation	$ 378				378
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals	$ 78				78
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals (in shares)	34,211
Balance at Dec. 31, 2017	$ 85,583	977	17,881	(4,397)	100,044
Balance (in shares) at Dec. 31, 2017	11,630,129
Balance at Mar. 31, 2017				(2,376)
Net income					2,548
Other comprehensive loss, net of taxes					93
Balance at Jun. 30, 2017				(2,283)
Balance at Dec. 31, 2017	$ 85,583	977	17,881	(4,397)	100,044
Net income			5,736		5,736
Other comprehensive loss, net of taxes				(2,421)	(2,421)
Stock dividend adjustment	$ 240		(240)		0
Stock dividend adjustment (in shares)	628
Cash in lieu of fractional shares			(10)		(10)
Cash in lieu of fractional shares (in shares)	(159)
Stock-based compensation	$ 225				225
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals	$ 0				0
Common shares issued related to restricted stock grants and ESPP, net of restricted stock reversals (in shares)	25,281
Stock options exercised, net	$ 0				0
Stock options exercised, net (in shares)	5,978
Balance at Jun. 30, 2018	$ 86,048	977	23,367	(6,818)	103,574
Balance (in shares) at Jun. 30, 2018	11,661,857
Balance at Mar. 31, 2018				(6,208)
Net income					3,003
Other comprehensive loss, net of taxes					(610)
Balance at Jun. 30, 2018	$ 86,048	$ 977	$ 23,367	$ (6,818)	$ 103,574
Balance (in shares) at Jun. 30, 2018	11,661,857