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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, 2016   15,476,379    
Beginning Balance at Dec. 31, 2016 $ 391,547 $ 156,041 $ 249,415 $ (13,909)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 20,310   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)   36,535    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings (545) $ (545)    
Cash dividends declared ($0.46 and $0.55 per share (7,166)   (7,166)  
Ending Balance (in shares) at Jun. 30, 2017   15,512,914    
Ending Balance at Jun. 30, 2017 406,960 $ 156,312 262,559 (11,911)
Beginning Balance (in shares) at Dec. 31, 2017   15,524,704    
Beginning Balance at Dec. 31, 2017 403,413 $ 156,904 266,723 (20,214)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 25,037   25,037  
Other comprehensive income, net of tax (10,515)     (10,515)
Stock-based compensation expense 1,011 $ 1,011    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)   51,545    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings (421) $ (421)    
Cash dividends declared ($0.46 and $0.55 per share (8,586)   (8,586)  
Ending Balance (in shares) at Jun. 30, 2018   15,576,249.000    
Ending Balance at Jun. 30, 2018 $ 409,939 $ 157,494 283,372 (30,927)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Cumulative-effect adjustment (Note 2)     $ 198 $ (198)