Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Capital Stock [Member]	Retained earnings [Member]	Accumulated other comprehensive income [Member]	Total
Balance at Dec. 31, 2013	$ 25,302	$ 39,519	$ 1,239	$ 66,060
Balance, shares at Dec. 31, 2013	2,391,617
Net income		6,352		6,352
Other comprehensive income (loss)			1,504	1,504
Issuance of common stock through Employee Stock Purchase Plan	$ 80			80
Issuance of common stock through Employee Stock Purchase Plan, shares	4,373
Issuance of common stock through Dividend Reinvestment Plan	$ 683			$ 683
Issuance of common stock through Dividend Reinvestment Plan, shares	26,527
Issuance of common stock from vested restricted share grants through stock compensation plans, shares	5,250
Issuance of common stock through exercise of stock options, shares
Stock-based compensation expense	$ 207			$ 207
Cash dividends declared		(2,667)		(2,667)
Balance, shares at Dec. 31, 2014	2,427,767
Balance at Dec. 31, 2014	$ 26,272	43,204	2,743	72,219
Net income		7,103		7,103
Other comprehensive income (loss)			(555)	(555)
Issuance of common stock through Employee Stock Purchase Plan	$ 102			102
Issuance of common stock through Employee Stock Purchase Plan, shares	4,358
Issuance of common stock from vested restricted share grants through stock compensation plans, shares	7,780
Issuance of common stock through exercise of stock options	$ 101			$ 101
Issuance of common stock through exercise of stock options, shares	3,500			3,500
Stock-based compensation expense	$ 225			$ 225
Cash dividends declared		(2,844)		(2,844)
Balance, shares at Dec. 31, 2015	2,443,405
Balance at Dec. 31, 2015	$ 26,700	47,463	2,188	76,351
Net income		7,693		7,693
Other comprehensive income (loss)			(807)	(807)
Issuance of common stock through Employee Stock Purchase Plan	$ 111			111
Issuance of common stock through Employee Stock Purchase Plan, shares	3,695
Issuance of common stock from vested restricted share grants through stock compensation plans, shares	6,205
Issuance of common stock through exercise of stock options	$ 14			$ 14
Issuance of common stock through exercise of stock options, shares	500			500
Stock-based compensation expense	$ 330			$ 330
Cash dividends declared		(3,061)		(3,061)
Balance, shares at Dec. 31, 2016	2,453,805
Balance at Dec. 31, 2016	$ 27,155	$ 52,095	$ 1,381	$ 80,631