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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
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 $ 841,956,000 $ 90,326,000 $ 213,098,000 $ 585,891,000 $ (13,784,000)     $ (33,575,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 40,953,000     40,953,000        
Other comprehensive income (loss), net of tax 926,000       926,000      
Cash dividends declared ($0.47 and $0.40 per share) (13,927,000)     (13,927,000)        
Treasury stock issued for restricted awards (66,615 shares, net of 37,592 forfeitures, and 74,903 shares, net of 7,370 forfeitures) (689,000)     (2,413,000)       1,724,000
Recognition of restricted stock compensation expense 1,843,000   1,843,000          
Ending Balance at Jun. 30, 2017 871,062,000 90,326,000 214,941,000 610,504,000 (12,858,000)     (31,851,000)
Effect of new accounting pronouncement on Consolidated Financial Statements | ASU No. 2018-02 0              
Effect of new accounting pronouncement on Consolidated Financial Statements | ASU No. 2016-01 [1]       862,000 (862,000)      
Beginning Balance at Dec. 31, 2017 884,031,000 90,326,000 216,106,000 628,107,000 (18,427,000)     (32,081,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 47,599,000     47,599,000        
Other comprehensive income (loss), net of tax (8,229,000)       (8,229,000)      
Reclassification of tax effects from the Tax Act | ASU No. 2018-02 [2]       3,427,000 (3,427,000) $ (3,660,000) $ 233,000  
Cash dividends declared ($0.47 and $0.40 per share) (16,391,000)     (16,391,000)        
Treasury stock issued for restricted awards (66,615 shares, net of 37,592 forfeitures, and 74,903 shares, net of 7,370 forfeitures) (656,000)     (1,492,000)       836,000
Recognition of restricted stock compensation expense 779,000   779,000          
Ending Balance at Jun. 30, 2018 $ 907,133,000 $ 90,326,000 $ 216,885,000 $ 662,112,000 $ (30,945,000)     $ (31,245,000)
[1] Reclassification due to the adoption of ASU No. 2016-01.
[2] 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.