Common Stock and Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 11, 2013
Common Stock and Earnings Per Share [Abstract]
Net income	$ 3,305	$ 2,935	$ 5,899	$ 5,516
Shares Used in Computing Basic and Diluted Earnings per Share [Abstract]
Weighted average common shares, basic (in shares)	12,895,687	12,839,968	12,886,154	12,844,500
Effect of dilutive securities [Abstract]
Employee stock-based compensation (in shares)	62	80	52	81
Weighted average common shares, diluted (in shares)	12,895,749	12,840,048	12,886,206	12,844,581
Stock Repurchase Program [Abstract]
Number of shares authorized to be repurchased under the stock repurchase program (in shares)					1,200,000
Number of shares repurchased under the stock repurchase program (in shares)	0	12,900	0	37,229
Number of remaining shares authorized to be repurchased under the stock repurchase program (in shares)	618,004		618,004