Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Common stock
Common stock transactions:
Common shares purchased and retired	17,981	14,112
Common shares issued	23,973	14,692
Non-vested common shares issued	122,912	130,904
Non-vested common shares forfeited	3,193	17,544
Stock options exercised	118,865	50,287
Shares tendered in payment of option price and income tax withholding amounts	39,667	106,185
Retained earnings
Cash dividends declared:
Common (in dollars per share)	0.24	0.225
Preferred (in dollars per share)	6.75%	6.75%