Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Common stock
Common stock transactions:
Common shares purchased and retired	588,409	124,867
Common shares issued	0	0
Non-vested common shares issued	156,956	147,876
Non-vested common shares forfeited	838	3,782
Stock options exercised	73,344	215,806
Shares tendered in payment of option price and income tax withholding amounts	22,042	152,131
Retained earnings
Cash dividends declared:
Common (in dollars per share)	0.20	0.16