Consolidated Balance Sheets (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, authorized shares	300,000	300,000
Preferred stock dividend rate, per share (as a percent)	5.00%	5.00%
Preferred stock, shares issued	73,000	73,000
Preferred stock, shares outstanding	73,000	73,000
Preferred stock, liquidation value (in dollars per share)	$ 1,000	$ 1,000
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, authorized shares	60,000,000	60,000,000
Common stock, shares issued	18,627,858	18,466,538
Common stock, shares outstanding	14,034,991	13,911,475
Treasury stock, shares	4,592,867	4,555,063