Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Basic earnings per share computation [Abstract]
Net income applicable to common stock	$ 3,464	$ 3,378	$ 10,666	$ 9,355
Weighted average common shares outstanding (in shares)	2,908,435	2,945,616	2,915,615	2,945,197
Earnings per share - basic (in dollars per share)	$ 1.19	$ 1.15	$ 3.66	$ 3.18
Diluted earnings per share computation [Abstract]
Net income applicable to common stock	$ 3,464	$ 3,378	$ 10,666	$ 9,355
Weighted average common shares outstanding for basic earnings per share (in shares)	2,908,435	2,945,616	2,915,615	2,945,197
Add: Dilutive effects of restricted stock	2,066	0	1,762	0
Weighted average common shares outstanding for dilutive earnings per share (in shares)	2,910,501	2,945,616	2,917,377	2,945,197
Earnings per share - dilutive (in dollars per share)	$ 1.19	$ 1.15	$ 3.66	$ 3.18
Antidilutive restricted stock excluded from net income per share calculations (in shares)	0	7,443	3,419	7,443