Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic earnings per share computation [Abstract]
Net income applicable to common stock	$ 3,753	$ 3,147	$ 7,202	$ 5,977
Weighted average common shares outstanding (in shares)	2,886,012	2,915,708	2,890,849	2,916,526
Earnings per share - basis (in dollars per share)	$ 1.30	$ 1.08	$ 2.49	$ 2.05
Diluted earnings per share computation [Abstract]
Net income applicable to common stock	$ 3,753	$ 3,147	$ 7,202	$ 5,977
Weighted average common shares outstanding for basic earnings per share (in shares)	2,886,012	2,915,708	2,890,849	2,916,526
Add: Dilutive effects of restricted stock	1,409	0	624	0
Weighted average common shares outstanding for dilutive earnings per share (in shares)	2,887,421	2,915,708	2,891,473	2,916,526
Earnings per share - dilutive (in dollars per share)	$ 1.30	$ 1.08	$ 2.49	$ 2.05
Antidilutive restricted stock excluded from net income per share calculations (in shares)	2,447	8,847	4,115	8,847