Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional paid-in capital commons stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Beginning Balance at Dec. 31, 2014	$ 72	$ 74,916	$ 49,386	$ 2,378	$ 126,752
Net income			12,262		12,262
Other comprehensive income, net of taxes				(888)	(888)
Stock options, exercised	2	2,009			2,011
Tax benefit on stock options		438			438
Cash dividends, common stock			(3,550)		(3,550)
Ending Balance at Dec. 31, 2015	74	77,363	58,098	1,490	137,025
Net income			13,241		13,241
Other comprehensive income, net of taxes				(2,744)	(2,744)
Stock options, exercised	1	975			976
Tax benefit on stock options		178			178
Stock repurchased	(2)	(4,352)			(4,354)
Cash dividends, common stock			(4,284)		(4,284)
Ending Balance at Dec. 31, 2016	73	74,164	67,055	(1,254)	140,038
Net income			12,315		12,315
Other comprehensive income, net of taxes				1,635	1,635
Stock options, exercised	1	1,155			1,156
Cash dividends, common stock			(4,862)		(4,862)
Ending Balance at Dec. 31, 2017	$ 74	$ 75,319	$ 74,508	$ 381	$ 150,282