Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at beginning of period at Dec. 31, 2015	$ 52,839	$ 2,808	$ 27,701	$ (2,114)	$ 28,206	$ (3,762)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,986				3,986
Other comprehensive loss	(729)					(729)
Stock compensation expense	205		205
Issuance of common stock for restricted stock awards	4	10	(6)
Cash dividends declared on common stock	(2,232)				(2,232)
Balance at end of period at Dec. 31, 2016	54,073	2,818	27,900	(2,114)	29,960	(4,491)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,277				4,277
Other comprehensive loss	(164)					(164)
Stock compensation expense	230		230
Exercise of stock options (53,586 shares)	1,375	67	1,308
Issuance of common stock (58,445 shares)	1,674	73	1,601
Issuance of common stock for restricted stock awards	0	8	(8)
Reclassification of disproportionate tax effects	0				863	(863)
Cash dividends declared on common stock	(2,374)				(2,374)
Balance at end of period at Dec. 31, 2017	$ 59,091	$ 2,966	$ 31,031	$ (2,114)	$ 32,726	$ (5,518)