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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 26,163     26,163        
Other comprehensive income (loss), net of tax (6,973)         (6,973)    
Reclassification of tax effects from the Tax Act | ASU No. 2018-02 [1]       3,691   (3,691) $ (3,924) $ 233
Cash dividends declared ($0.22 and $0.27 per share) (7,669)     (7,669)        
Treasury stock issued for restricted awards (66,165 shares, net of 37,592 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 (31,509) (29,953)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Effect of new accounting pronouncement on Consolidated Financial Statements | ASU No. 2016-01       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 22,928     22,928        
Other comprehensive income (loss), net of tax 6,176         6,176    
Cash dividends declared ($0.22 and $0.27 per share) (9,317)     (9,317)        
Treasury stock issued for restricted awards (66,165 shares, net of 37,592 forfeitures) (876)     481 (1,357)      
Repurchase of S&T Stock (313,904 shares) (12,287)       (12,287)      
Recognition of restricted stock compensation expense 604   604          
Ending Balance at Mar. 31, 2019 $ 943,156 $ 90,326 $ 210,949 $ 716,078 $ (57,266) $ (16,931)    
[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.