Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic earnings per share computation [Abstract]
Net income applicable to common stock	$ 3,368	$ 3,512	$ 9,909	$ 10,079
Weighted average common shares outstanding (in shares)	3,035,214	3,054,226	3,038,973	3,059,520
Earnings per share - basic (in dollars per share)	$ 1.11	$ 1.15	$ 3.26	$ 3.29
Diluted earnings per share computation [Abstract]
Weighted average common shares outstanding for basic earnings per share (in shares)	3,035,214	3,054,226	3,038,973	3,059,520
Add: Dilutive effects of restricted stock (in shares)	1,486	1,483	1,427	1,288
Weighted average common shares outstanding for dilutive earnings per share (in shares)	3,036,700	3,055,709	3,040,400	3,060,808
Earnings per share - diluted (in dollars per share)	$ 1.11	$ 1.15	$ 3.26	$ 3.29
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)	1,938	1,037	2,913	3,280
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)	$ 34.70	$ 36.00	$ 34.70	$ 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)	$ 50.50	$ 44.50	$ 50.50	$ 44.50