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Consolidated Statements Of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income   $ 72 $ (72)  
Stock Issued During Period, Shares, Stock Splits   (173)    
Stockholders' Equity Note, Stock Split, Reduction of Capital $ (5) $ (5)    
Beginning Balance (in shares) at Dec. 31, 2015   15,330,717    
Beginning Balance at Dec. 31, 2015 363,190 $ 153,083 222,329 $ (12,222)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 40,067   40,067  
Cash in lieu for fractional shares paid due to the stock split (Note 13) (1,687)     (1,687)
Net income 1,997 $ 1,997    
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)   145,835    
Other comprehensive loss, net of tax 894 $ 894    
Cash dividends declared ( $0.74, $0.80 and $0.83 per share in 2016, 2015, and 2014, respectively) (12,909)   (12,909)  
Ending Balance (in shares) at Dec. 31, 2016   15,476,379    
Ending Balance at Dec. 31, 2016 391,547 $ 156,041 249,415 (13,909)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 28,476   28,476  
Reclassification from AOCI, Current Period, Tax     3,476 (3,476)
Cash in lieu for fractional shares paid due to the stock split (Note 13) (2,829)     (2,829)
Net income 1,469 $ 1,469    
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)   48,325    
Other comprehensive loss, net of tax (606) $ (606)    
Cash dividends declared ( $0.74, $0.80 and $0.83 per share in 2016, 2015, and 2014, respectively) (14,644)   (14,644)  
Ending Balance (in shares) at Dec. 31, 2017   15,524,704.000    
Ending Balance at Dec. 31, 2017 403,413 $ 156,904 266,723 (20,214)
Cumulative Effect of New Accounting Principle in Period of Adoption     198 (198)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 53,071   53,071  
Cash in lieu for fractional shares paid due to the stock split (Note 13) (4,008)     (4,008)
Net income 1,688 $ 1,688    
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings and tax benefit (in shares)   67,960    
Other comprehensive loss, net of tax $ (350) $ (350)    
Common stock repurchased (in shares) (750)      
Stock-based compensation expense $ (27) $ (27)    
Cash dividends declared ( $0.74, $0.80 and $0.83 per share in 2016, 2015, and 2014, respectively) (17,962)   (17,962)  
Ending Balance (in shares) at Dec. 31, 2018   15,591,914.000    
Ending Balance at Dec. 31, 2018 $ 435,825 $ 158,215 $ 302,030 $ (24,420)