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Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Common stock    
Common stock transactions:    
Common shares purchased and retired 20,621 1,015,389
Common shares issued 200 16,347
Non-vested common shares issued 132,531 190,239
Non-vested common shares forfeited 7,214 29,844
Stock options exercised 112,936 336,598
Shares tendered in payment of option price and income tax withholding amounts 43,534 104,643
Retained earnings    
Cash dividends declared:    
Common (in dollars per share) $ 0.24 $ 0.88