Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Common Stock [Member] Employee Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Balance (in shares) at Dec. 31, 2013		3,271,658
Balance at Dec. 31, 2013	$ 75,625	$ 2,148		$ 13,747	$ 65,618	$ (3,412)	$ (2,476)
Net income	8,998				8,998
Other comprehensive income (loss), net of tax	4,319					4,319
Cash dividends declared	$ (3,688)				(3,688)
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)	3,239	29,288	3,239
Stock issued in connection with dividend reinvestment and stock purchase plan	$ 749	$ 18		731
Stock issued for employee stock purchase plan	$ 74	$ 2		72
Stock issued for options exercised (in shares)	20,050	12,473
Stock issued for options exercised	$ 165	$ 8		157
Tax benefit of stock options exercised	29			29
Stock-based compensation expense	83			83
Balance (in shares) at Dec. 31, 2014		3,316,658
Balance at Dec. 31, 2014	86,354	$ 2,176		14,819	70,928	907	(2,476)
Net income	8,233				8,233
Other comprehensive income (loss), net of tax	(1,453)					(1,453)
Cash dividends declared	$ (3,872)				(3,872)
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)	3,186	30,667	3,186
Stock issued in connection with dividend reinvestment and stock purchase plan	$ 871	$ 19		852
Stock issued for employee stock purchase plan	$ 83	$ 2		81
Stock issued for options exercised (in shares)	13,750	9,283
Stock issued for options exercised	$ 121	$ 6		115
Tax benefit of stock options exercised	21			21
Stock-based compensation expense	$ 85			85
Balance (in shares) at Dec. 31, 2015	3,359,794	3,359,794
Balance at Dec. 31, 2015	$ 90,443	$ 2,203		15,973	75,289	(546)	(2,476)
Net income	8,924				8,924
Other comprehensive income (loss), net of tax	(3,211)					(3,211)
Cash dividends declared	$ (4,066)				(4,066)
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)	2,932	31,595	2,932
Stock issued in connection with dividend reinvestment and stock purchase plan	$ 983	$ 19		964
Stock issued for employee stock purchase plan	$ 81	$ 2		79
Stock issued for options exercised (in shares)	22,700	17,380
Stock issued for options exercised	$ 308	$ 11		297
Tax benefit of stock options exercised	17			17
Stock-based compensation expense	$ 88			88
Balance (in shares) at Dec. 31, 2016	3,411,701	3,411,701
Balance at Dec. 31, 2016	$ 93,567	$ 2,235		$ 17,418	$ 80,147	$ (3,757)	$ (2,476)