Consolidated Statements Of Changes In Shareholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2011 $ 218,876 $ 51,438 $ 165,377 $ 2,061
Beginning Balance (in shares) at Dec. 31, 2011   7,664,975    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 23,428   23,428  
Other comprehensive income, net of tax 936     936
Stock-based compensation expense 538 538    
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)   23,355    
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (212) (212)    
Common stock repurchased (in shares)   (65,580)    
Common stock repurchased (2,097) (2,097)    
Cash dividends declared ($1.00, $1.08 and $1.11 per share in 2012, 2013, and 2014, respectively) (7,654)   (7,654)  
Ending Balance at Dec. 31, 2012 233,815 49,667 181,151 2,997
Ending Balance (in shares) at Dec. 31, 2012   7,622,750    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 22,783   22,783  
Other comprehensive income, net of tax (15,344)     (15,344)
Stock-based compensation expense 596 596    
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)   25,308    
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit 300 300    
Common stock repurchased (in shares)   (68,145)    
Common stock repurchased (2,780) (2,780)    
Cash dividends declared ($1.00, $1.08 and $1.11 per share in 2012, 2013, and 2014, respectively) (8,274)   (8,274)  
Ending Balance at Dec. 31, 2013 231,096 47,783 195,660 (12,347)
Ending Balance (in shares) at Dec. 31, 2013   7,579,913    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 24,570   24,570  
Other comprehensive income, net of tax 3,922     3,922
Stock-based compensation expense 599 599    
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)   27,664    
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit 328 328    
Common stock repurchased (in shares)   (181,355)    
Common stock repurchased (7,155) (7,155)    
Cash dividends declared ($1.00, $1.08 and $1.11 per share in 2012, 2013, and 2014, respectively) (8,251)   (8,251)  
Ending Balance at Dec. 31, 2014 $ 245,109 $ 41,555 $ 211,979 $ (8,425)
Ending Balance (in shares) at Dec. 31, 2014   7,426,222