Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Common stock
Common stock transactions:
Common shares purchased and retired	588,409	349,930
Common shares issued	21,414	24,581
Non-vested common shares issued	156,956	147,876
Non-vested common shares forfeited	1,678	8,647
Stock options exercised	129,885	286,069
Shares tendered in payment of option price and income tax withholding amounts	37,357	160,377
Retained earnings
Cash dividends declared:
Common (in dollars per share)	$ 0.40	$ 0.32