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Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive income (loss)
Balance at Dec. 31, 2009 $ 153,614 $ 6,244 $ 9,729 $ 135,442 $ 2,199
Balance (in shares) at Dec. 31, 2009   13,607      
Increase (Decrease) in Stockholders' Equity          
Net income 22,953     22,953  
Other comprehensive income (loss), net of tax 940       940
Stock compensation expense 952   952    
Shares issued for stock options exercised 1,230 311 919    
Shares issued for stock options exercised (in shares)   93      
Shares issued for dividend reinvestment plan 16 2 14    
Shares issued for dividend reinvestment plan (in shares)   1      
Shares issued for non-vested restricted stock   181 961 (1,142)  
Shares issued for non-vested restricted stock (in shares)   54      
Cash dividends, $0.77, $0.72 and $0.69 per share for the year ended December 31, 2012, 2011 and 2010, respectively (9,448)     (9,448)  
Shares repurchased and cancelled (396) (59) (369) 32  
Shares repurchased and cancelled (in shares)   (18)      
Balance at Dec. 31, 2010 169,861 6,679 12,206 147,837 3,139
Balance (in shares) at Dec. 31, 2010   13,737      
Increase (Decrease) in Stockholders' Equity          
Net income 23,604     23,604  
Other comprehensive income (loss), net of tax 2,323       2,323
Stock compensation expense 1,165   1,165    
Shares issued for stock options exercised 650 157 493    
Shares issued for stock options exercised (in shares)   47      
Shares issued for dividend reinvestment plan 13 2 11    
Shares issued for dividend reinvestment plan (in shares)   1      
Shares issued for non-vested restricted stock   140 866 (1,006)  
Shares issued for non-vested restricted stock (in shares)   42      
Cash dividends, $0.77, $0.72 and $0.69 per share for the year ended December 31, 2012, 2011 and 2010, respectively (9,930)     (9,930)  
Shares repurchased and cancelled   (25) (142) 167  
Shares repurchased and cancelled (in shares)   (8)      
Balance at Dec. 31, 2011 187,686 6,953 14,599 160,672 5,462
Balance (in shares) at Dec. 31, 2011   13,819      
Increase (Decrease) in Stockholders' Equity          
Net income 25,801     25,801  
Other comprehensive income (loss), net of tax (41)       (41)
Stock compensation expense 1,481   1,481    
Shares issued for stock options exercised 1,374 230 1,146 (2)  
Shares issued for stock options exercised (in shares)   69      
Shares issued for dividend reinvestment plan 23 3 20    
Shares issued for dividend reinvestment plan (in shares)   1      
Shares issued for non-vested restricted stock   190 1,108 (1,298)  
Shares issued for non-vested restricted stock (in shares)   57      
Cash dividends, $0.77, $0.72 and $0.69 per share for the year ended December 31, 2012, 2011 and 2010, respectively (10,691)     (10,691)  
Shares repurchased and cancelled (558) (103) (623) 168  
Shares repurchased and cancelled (in shares)   (31)      
Balance at Dec. 31, 2012 $ 205,075 $ 7,273 $ 17,731 $ 174,650 $ 5,421
Balance (in shares) at Dec. 31, 2012   13,915