Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Basic earnings per share computation [Abstract]
Net income applicable to common stock	$ 3,512	[1]	$ 3,464	$ 10,079	[1]	$ 10,666
Weighted average common shares outstanding (in shares)	3,024,507		3,052,628	3,029,801		3,059,808
Earnings per share - basic (in dollars per share)	$ 1.16		$ 1.13	$ 3.33		$ 3.49
Diluted earnings per share computation [Abstract]
Weighted average common shares outstanding for basic earnings per share (in shares)	3,024,507		3,052,628	3,029,801		3,059,808
Add: Dilutive effects of restricted stock (in shares)	1,483		2,066	1,288		1,762
Weighted average common shares outstanding for dilutive earnings per share (in shares)	3,025,990		3,054,694	3,031,089		3,061,570
Earnings per share - diluted (in dollars per share)	$ 1.16		$ 1.13	$ 3.33		$ 3.48
Antidilutive restricted stock excluded from net income per share calculations (in shares)	1,037		0	3,280		3,419

[1] Amounts in parentheses indicate debits to profit/loss