Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Common stock
Common stock transactions:
Common shares purchased and retired	25,677	17,904
Common shares issued	0	2,358
Non-vested common shares issued	108,873	122,912
Non-vested common shares forfeited	1,815	1,556
Stock options exercised	243,238	100,991
Shares tendered in payment of option price and income tax withholding amounts	87,933	37,397
Retained earnings
Cash dividends declared:
Common (in dollars per share)	0.00	0.1200
Preferred (in dollars per share)	0.00%	6.75%