Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Common stock transactions:
Common shares purchased and retired, shares	17,926	246,596	642,752
Common shares issued, shares	15,440	11,506,503	254,156
Non-vested common shares issued, shares	130,904	117,140	64,136
Non-vested common shares forfeited, shares	27,963	18,821	0
Stock options exercised, shares	83,025	92,880	299,436
Shares tendered in payment of option price and income tax withholding amounts, shares	174,583	111,792	175,464
Cash dividends declared:
Common stock, per-share dividends declared	$ 0.45	$ 0.45	$ 0.50
Preferred stock, per-share dividends declared	6.75%	6.75%	6.75%