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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive (Loss)/Income
Reclassifications Related to Funded Status of Pension
Reclassifications Related to Unrealized Gains on Available for Sale Securities
Treasury Stock
Beginning Balance at Dec. 31, 2016 $ 841,956 $ 90,326 $ 213,098 $ 585,891 $ (13,784)     $ (33,575)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 18,188     18,188        
Other comprehensive income (loss), net of tax 1,188       1,188      
Cash dividends declared ($0.22 and $0.20) (in dollars per share) (6,960)     (6,960)        
Treasury stock issued for restricted awards (66,615 shares, net of 37,592 forfeitures, and 74,903 shares, net of 7,370 forfeitures) (194)     (2,014)       1,820
Recognition of restricted stock compensation expense 1,002   1,002          
Ending Balance at Mar. 31, 2017 855,180 90,326 214,100 595,105 (12,596)     (31,755)
Beginning Balance at Dec. 31, 2017 884,031 90,326 216,106 628,107 (18,427)     (32,081)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 26,163     26,163        
Other comprehensive income (loss), net of tax (6,973)       (6,973)      
Reclassification of tax effects from the Tax Act (3,700)              
Reclassification of tax effects from the Tax Act | Accounting Standards Update 2018-02 [1]       3,691 (3,691) $ (3,924) $ 233  
Cash dividends declared ($0.22 and $0.20) (in dollars per share) (7,669)     (7,669)        
Treasury stock issued for restricted awards (66,615 shares, net of 37,592 forfeitures, and 74,903 shares, net of 7,370 forfeitures) (657)     (1,229)       572
Recognition of restricted stock compensation expense 512   512          
Ending Balance at Mar. 31, 2018 $ 895,407 $ 90,326 $ 216,618 $ 649,925 $ (29,953)     $ (31,509)
[1] Reclassification due to the adoption of ASU No. 2018-02 - $(3,924) relates to funded status of pension and $233 relates to net unrealized gains on available-for-sale securities.