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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2015 [1]   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 18,262   18,262  
Other comprehensive income, net of tax 8,214     8,214
Stock-based compensation expense 1,042 $ 1,042    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares) [1]   90,934    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings 377 $ 377    
Cash dividends declared ($0.40 and $0.46 per share in six months ended June 30, 2016 and June 30, 2017) [1] (6,229)   (6,229)  
Ending Balance (in shares) at Jun. 30, 2016 [1]   15,421,651    
Ending Balance at Jun. 30, 2016 384,856 $ 154,574 234,290 (4,008)
Beginning Balance (in shares) at Dec. 31, 2015 [1]   15,330,717    
Beginning Balance at Dec. 31, 2015 363,190 $ 153,083 222,329 (12,222)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Cumulative effect adjustment(2) [2]   $ 72 (72)  
Ending Balance (in shares) at Dec. 31, 2016 [1]   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 20,310      
Other comprehensive income, net of tax 1,998     1,998
Stock-based compensation expense 816 $ 816    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares) [1]   36,535    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings (545) $ (545)    
Cash dividends declared ($0.40 and $0.46 per share in six months ended June 30, 2016 and June 30, 2017) [1] (7,166)   (7,166)  
Ending Balance (in shares) at Jun. 30, 2017 [1]   15,512,914.000    
Ending Balance at Jun. 30, 2017 $ 406,960 $ 156,312 $ 262,559 $ (11,911)
[1] (1) Share and per share amounts as of December 31, 2015 and as of and for the six months ended June 30, 2016 have been adjusted to reflect the three-for-two stock split effective September 30, 2016.
[2] (2)In the second quarter of 2016, the Company adopted ASU 2016-09, effective January 1, 2016. The Company made a policy election to not estimate the forfeiture rate in the accounting for share-based compensation on its unvested share-based awards. The change in policy was accounted for on a modified-retrospective basis and represents the cumulative effect adjustment to shareholders' equity.