Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Common stock transactions:
Common shares purchased and retired	17,904	12,056
Common shares issued	2,358	0
Non-vested common shares issued	122,912	130,904
Non-vested common shares forfeited	1,556	1,911
Stock options exercised	100,991	43,622
Shares tendered in payment of option price and income tax withholding amounts	37,397	104,050
Cash dividends declared:
Common	$ 0.12	$ 0.1125
Preferred	6.75%	6.75%