Stockholders' Equity (Stock Rollforward) (Details) (USD $)	12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Preferred Stock	Dec. 31, 2012 Preferred Stock	Dec. 31, 2009 Preferred Stock	Dec. 31, 2012 Common Stock	Dec. 31, 2011 Common Stock	Dec. 31, 2010 Common Stock	Dec. 31, 2012 Treasury Stock	Dec. 31, 2011 Treasury Stock	Dec. 31, 2010 Treasury Stock
Class of Stock [Line Items]
Repurchase of preferred shares and common stock warrant				(39,000)
Increase (Decrease) in Stock by Class [Roll Forward]
Preferred stock, shares issued, beginning of period		0	0	39,000	0	39,000
Common stock, shares issued, beginning of period		11,155,648	11,122,247				11,122,247	11,070,022	11,031,892
Treasury stock, shares, beginning of period		607,688	615,123							615,123	612,695	657,255
Changes related to stock-based compensation awards:
Release of restricted common shares, common stock							14,552	21,510	7,202
Release of restricted common shares, treasury stock										4,270	5,443
Stock Issued During Period, Value, Stock Options Exercised	$ 427,000											$ (31,008)
Changes related to deferred compensation plan:
Purchase of treasury stock										3,918	8,623	11,855
Re-issuance of treasury stock										(8,897)	(9,209)	(25,407)
Common shares issued under dividend reinvestment plan							18,849	24,770	30,928
Common shares issued under Board of Directors' compensation plan							0	5,945		(6,726)	(2,429)
Preferred stock, shares issued, end of period		0	0	0	0	39,000
Common stock, shares issued, end of period		11,155,648	11,122,247				11,155,648	11,122,247	11,070,022
Treasury stock, shares, end of period		607,688	615,123							607,688	615,123	612,695