CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Dec. 31, 2014	$ 126	$ 63,532	$ 76,495	$ 316	$ 140,469
Net income			7,108		7,108
Other comprehensive income				(387)	(387)
Stock-based compensation		283			283
Cash dividends declared			(506)		(506)
Balances at Dec. 31, 2015	126	63,815	83,097	(71)	146,967
Net income			9,638		9,638
Other comprehensive income				(922)	(922)
Common shares issued for employee stock- based awards		53			53
Stock-based compensation	1	333			334
Cash dividends declared			(1,771)		(1,771)
Balances at Dec. 31, 2016	127	64,201	90,964	(993)	154,299
Net income			11,262		11,262
Other comprehensive income				(90)	(90)
Reclass of stranded tax effects from change in tax tax rate			226	(226)
Stock-based compensation		1,055			1,055
Cash dividends declared			(2,790)		(2,790)
Balances at Dec. 31, 2017	$ 127	$ 65,256	$ 99,662	$ (1,309)	$ 163,736