Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic earnings per share computation [Abstract]
Net income applicable to common stock	$ 3,189	$ 3,365	$ 6,309	$ 6,541
Weighted average common shares outstanding (in shares)	3,019,661	3,039,734	3,022,945	3,040,822
Earnings per share - basic (in dollars per share)	$ 1.06	$ 1.11	$ 2.09	$ 2.15
Diluted earnings per share computation [Abstract]
Weighted average common shares outstanding for basic earnings per share (in shares)	3,019,661	3,039,734	3,022,945	3,040,822
Add: Dilutive effects of restricted stock (in shares)	1,064	927	534	405
Weighted average common shares outstanding for dilutive earnings per share (in shares)	3,020,725	3,040,661	3,023,479	3,041,227
Earnings per share - diluted (in dollars per share)	$ 1.06	$ 1.11	$ 2.09	$ 2.15
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)	3,287	2,188	3,287	2,409
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)	$ 44.50	$ 50.15	$ 44.50	$ 34.70
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	$ 50.50	$ 53.15	$ 50.50