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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, 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 39,094   39,094  
Other comprehensive income, net of tax [1] (15,327)     (15,327)
Stock-based compensation expense 1,405 $ 1,405    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)   59,822    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings (290) $ (290)    
Cash dividends declared (13,274)   (13,274)  
Ending Balance (in shares) at Sep. 30, 2018   15,584,526    
Ending Balance at Sep. 30, 2018 415,686 $ 158,019 292,741 (35,074)
Beginning Balance (in shares) at Jun. 30, 2018   15,576,249    
Beginning Balance at Jun. 30, 2018 408,819 $ 157,494 283,372 (32,047)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 14,057   14,057  
Other comprehensive income, net of tax (3,027)     (3,027)
Stock-based compensation expense 394 $ 394    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)   8,277    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings 131 $ 131    
Cash dividends declared (4,688)   (4,688)  
Ending Balance (in shares) at Sep. 30, 2018   15,584,526    
Ending Balance at Sep. 30, 2018 415,686 $ 158,019 292,741 (35,074)
Beginning Balance (in shares) at Dec. 31, 2018   15,591,914    
Beginning Balance at Dec. 31, 2018 435,825 $ 158,215 302,030 (24,420)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 41,965   41,965  
Other comprehensive income, net of tax 23,537     23,537
Stock-based compensation expense 1,364 $ 1,364    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)   37,202    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings (190) $ (190)    
Cash dividends declared (13,909)   (13,909)  
Common stock repurchased (17,174) $ 17,174    
Common stock repurchased (in shares)   (404,213)    
Ending Balance (in shares) at Sep. 30, 2019   15,224,903.000    
Ending Balance at Sep. 30, 2019 471,672 $ 142,215 330,340 (883)
Beginning Balance (in shares) at Jun. 30, 2019   15,457,480.00    
Beginning Balance at Jun. 30, 2019 467,759 $ 151,801 320,421 (4,463)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 14,488   14,488  
Other comprehensive income, net of tax 3,580     3,580
Stock-based compensation expense 429 $ 429    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)   4,858    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings 51 $ 51    
Cash dividends declared (4,569)   (4,569)  
Common stock repurchased (10,066) $ 10,066    
Common stock repurchased (in shares)   (237,435)    
Ending Balance (in shares) at Sep. 30, 2019   15,224,903.000    
Ending Balance at Sep. 30, 2019 $ 471,672 $ 142,215 $ 330,340 $ (883)
[1] Effective January 1, 2018, the Company adopted ASU 2016-01, Income Statement - Financial Instruments. As a result of the adoption, the Company reclassified its unrealized gain on equity investments from accumulated other comprehensive loss to retained earnings.