Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings per share basic and diluted [Abstract]
Net income applicable to common stock	$ 3,153	$ 2,857	$ 9,467	$ 9,166
Basic earnings per share computation [Abstract]
Weighted average common shares outstanding (in shares)	3,339,962	3,044,311	3,346,623	3,051,826
Earnings per share - basic (in dollars per share)	$ 0.94	$ 0.94	$ 2.83	$ 3.00
Diluted earnings per share computation [Abstract]
Weighted average common shares outstanding for basic earnings per share (in shares)	3,339,962	3,044,311	3,346,623	3,051,826
Add: Dilutive effects of restricted stock (in shares)	1,694	1,464	1,698	1,468
Weighted average common shares outstanding for dilutive earnings per share (in shares)	3,341,656	3,045,775	3,348,321	3,053,294
Earnings per share - diluted (in dollars per share)	$ 0.94	$ 0.94	$ 2.83	$ 3.00
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive restricted stock excluded from net income per share calculations (in shares)	3,804	2,696	3,804	2,696
Restricted Stock [Member] | Minimum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock share price range (in dollars per share)	$ 46.69	$ 44.50	$ 46.69	$ 44.50
Restricted Stock [Member] | Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock share price range (in dollars per share)	$ 53.15	$ 53.15	$ 53.15	$ 53.15