Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Common stock
Common stock transactions:
Common shares purchased and retired	387,967	25,677
Common shares issued	1,402,811	26,096
Non-vested common shares issued	147,876	120,873
Non-vested common shares forfeited	17,741	10,517
Stock options exercised	372,880	688,864
Shares tendered in payment of option price and income tax withholding amounts	166,780	336,442
Retained earnings
Cash dividends declared:
Common (in dollars per share)	$ 0.48	$ 0.2700