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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive (Loss)/Income
Reclassifications Related to Funded Status of Pension
Reclassifications Related to Unrealized Gains on Available for Sale Securities
Beginning Balance at Dec. 31, 2017 $ 884,031 $ 90,326 $ 216,106 $ 628,107 $ (32,081) $ (18,427)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 47,599     47,599        
Other comprehensive income (loss), net of tax (8,229)         (8,229)    
Reclassification of tax effects from the Tax Act | ASU No. 2018-02 [1] 0     3,427   (3,427) $ (3,660) $ 233
Cash dividends declared (16,391)     (16,391)        
Treasury stock issued for restricted awards (656)     (1,492) 836      
Recognition of restricted stock compensation expense 779   779          
Ending Balance at Jun. 30, 2018 907,133 90,326 216,885 662,112 (31,245) (30,945)    
Beginning Balance at Mar. 31, 2018 895,407 90,326 216,618 649,925 (31,509) (29,953)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 21,436     21,436        
Other comprehensive income (loss), net of tax (1,256)         (1,256)    
Reclassification of tax effects from the Tax Act | ASU No. 2018-02 [2] 0     (264)   264    
Cash dividends declared (8,722)     (8,722)        
Treasury stock issued for restricted awards 1     (263) 264      
Recognition of restricted stock compensation expense 267   267          
Ending Balance at Jun. 30, 2018 907,133 90,326 216,885 662,112 (31,245) (30,945)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Effect of new accounting pronouncement on Consolidated Financial Statements | ASU No. 2016-01 [3] 0     862   (862)    
Beginning Balance at Dec. 31, 2018 935,761 90,326 210,345 701,819 (43,622) (23,107)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 49,029     49,029        
Other comprehensive income (loss), net of tax 13,588         13,588    
Cash dividends declared (18,559)     (18,559)        
Treasury stock issued for restricted awards (891)     (1,879) 988      
Repurchase of common stock (15,122)       (15,122)      
Recognition of restricted stock compensation expense 980   980          
Ending Balance at Jun. 30, 2019 964,953 90,326 211,325 730,577 (57,756) (9,519)    
Beginning Balance at Mar. 31, 2019 943,156 90,326 210,949 716,078 (57,266) (16,931)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 26,101     26,101        
Other comprehensive income (loss), net of tax 7,412         7,412    
Cash dividends declared (9,242)     (9,242)        
Treasury stock issued for restricted awards (15)     (2,360) 2,345      
Repurchase of common stock (2,835)       (2,835)      
Recognition of restricted stock compensation expense 376   376          
Ending Balance at Jun. 30, 2019 $ 964,953 $ 90,326 $ 211,325 $ 730,577 $ (57,756) $ (9,519)    
[1] Reclassification due to the adoption of ASU No. 2018-02, $(3,660) relates to funded status of pension and $233 relates to net unrealized gains on available-for-sale securities.
[2] Reclassification due to the adoption of ASU No. 2018-02 related to funded status of pension.
[3] Reclassification due to the adoption of ASU No. 2016-01.