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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 25,037   25,037  
Other comprehensive income, net of tax [1] (12,300)     (12,300)
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 (8,586)   (8,586)  
Ending Balance (in shares) at Jun. 30, 2018   15,576,249    
Ending Balance at Jun. 30, 2018 408,819 $ 157,494 283,372 (32,047)
Beginning Balance (in shares) at Mar. 31, 2018   15,565,868    
Beginning Balance at Mar. 31, 2018 403,047 $ 156,860 275,841 (29,654)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 12,217   12,217  
Other comprehensive income, net of tax (2,393)     (2,393)
Stock-based compensation expense 580 $ 580    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)   10,381    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings 54 $ 54    
Cash dividends declared (4,686)   (4,686)  
Ending Balance (in shares) at Jun. 30, 2018   15,576,249    
Ending Balance at Jun. 30, 2018 408,819 $ 157,494 283,372 (32,047)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Cumulative-effect adjustment | ASU 2016-01 [1]     198 (198)
Cumulative-effect adjustment | ASU 2017-12 [2] 665     665
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 27,477   27,477  
Other comprehensive income, net of tax 19,957     19,957
Stock-based compensation expense 935 $ 935    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)   32,344    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings (241) $ (241)    
Cash dividends declared (9,340)   (9,340)  
Stock Repurchased During Period, Value (7,108) $ 7,108    
Stock Repurchased During Period, Shares   (166,778)    
Ending Balance (in shares) at Jun. 30, 2019   15,457,480.00    
Ending Balance at Jun. 30, 2019 467,759 $ 151,801 320,421 (4,463)
Beginning Balance (in shares) at Mar. 31, 2019   15,560,565    
Beginning Balance at Mar. 31, 2019 453,718 $ 156,152 311,870 (14,304)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net Income 13,204   13,204  
Other comprehensive income, net of tax 9,841     9,841
Stock-based compensation expense 477 $ 477    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)   8,136    
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings (26) $ (26)    
Cash dividends declared (4,653)   (4,653)  
Stock Repurchased During Period, Value (4,802) $ 4,802    
Stock Repurchased During Period, Shares   (111,221)    
Ending Balance (in shares) at Jun. 30, 2019   15,457,480.00    
Ending Balance at Jun. 30, 2019 467,759 $ 151,801 320,421 $ (4,463)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Cumulative-effect adjustment | ASU 2016-02 [3] $ 254   $ 254  
[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.
[2] Effective January 1, 2018, the Company adopted ASU 2017-12, Derivatives and Hedging. In conjunction with the adoption, the Company made the transition election to reclassify qualifying securities designated as held-to-maturity to available-for-sale.
[3] Effective January 1, 2019, the Company adopted ASU 2016-02, Leases, on a modified-retrospective basis. Refer to Note 2 for further details.