Shareholders' Equity - Summary of shareholders' equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Common stock	Capital in excess of par value	Retained earnings	ESOP	Treasury stock	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2012	$ 523	$ 13,987	$ 11,771	$ (1,165)	$ (1,765)	$ (85)	$ 23,266
Balance (shares) at Dec. 31, 2012	2,614,506						2,614,506
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,039				1,039
Purchase of treasury shares					(371)		(371)
Cash dividend			(406)				(406)
Stock based compensation					165		165
Exercise of stock options, net of tax benefit		21	(38)		109		92
Balance at Sep. 30, 2013	$ 523	$ 14,008	$ 12,366	$ (1,165)	$ (1,862)	$ (85)	$ 23,785
Balance (shares) at Sep. 30, 2013	2,614,506						2,614,506