Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Common stock
Common stock transactions:
Common shares purchased and retired	25,677	17,981
Common shares issued	26,096	23,973
Non-vested common shares issued	108,873	122,912
Non-vested common shares forfeited	10,138	3,193
Stock options exercised	446,404	118,865
Shares tendered in payment of option price and income tax withholding amounts	150,290	39,667
Retained earnings
Cash dividends declared:
Common (in dollars per share)	$ 0.13	$ 0.2400
Preferred (in dollars per share)	0.00%	6.75%