Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Common stock
Common stock transactions:
Common shares purchased and retired	789,743	387,967
Common shares issued	21,414	1,402,811
Non-vested common shares issued	169,577	147,876
Non-vested common shares forfeited	3,484	17,741
Stock options exercised	158,828	372,880
Shares tendered in payment of option price and income tax withholding amounts	58,996	166,780
Retained earnings
Cash dividends declared:
Common (in dollars per share)	$ 0.60	$ 0.48