Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Common stock
Common stock transactions:
Common shares purchased and retired	25,677	18,333
Common shares issued	26,096	23,973
Non-vested common shares issued	120,873	122,912
Non-vested common shares forfeited	10,517	4,689
Stock options exercised	688,864	144,346
Shares tendered in payment of option price and income tax withholding amounts	336,442	102,213
Retained earnings
Cash dividends declared:
Common (in dollars per share)	$ 0.27	$ 0.3600
Preferred (in dollars per share)	0.00%	6.75%