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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
$ in Thousands
Total
Common  Stock
Paid In  Capital
Retained  Earnings
Treasury  Stock
Accumulated Other Comprehensive Income (Loss)
Cumulative effect of accounting change
Cumulative effect of accounting change
Retained  Earnings
Cumulative effect of accounting change
Accumulated Other Comprehensive Income (Loss)
Adjusted beginning balance
Adjusted beginning balance
Common  Stock
Adjusted beginning balance
Paid In  Capital
Adjusted beginning balance
Retained  Earnings
Adjusted beginning balance
Treasury  Stock
Adjusted beginning balance
Accumulated Other Comprehensive Income (Loss)
Beginning balance, net of tax at Dec. 31, 2019 $ 804,580 $ 47,360 $ 766,718 $ 80,274 $ (94,008) $ 4,236 $ (7,830) $ (7,830) $ 0 $ 796,750 $ 47,360 $ 766,718 $ 72,444 $ (94,008) $ 4,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Net income 82,153     82,153                      
Other comprehensive income (loss) 64,844         64,844                  
Issuance of common stock for dividend reinvestment plan 1,424 59 1,365                        
Purchase of common stock (30,989)       (30,989)                    
Stock compensation expense 3,020   3,020                        
Net issuance of common stock under employee stock plan 1,299 0 408 (185) 1,076                    
Cash dividends paid on common stock (43,204)     (43,204)                      
Ending balance, net of tax at Dec. 31, 2020 875,297 47,419 771,511 111,208 (123,921) 69,080                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Net income 113,401     113,401                      
Other comprehensive income (loss) (9,375)         (9,375)                  
Issuance of common stock for dividend reinvestment plan 1,353 42 1,311                        
Purchase of common stock (34,148)       (34,148)                    
Stock compensation expense 3,020   3,020                        
Net issuance of common stock under employee stock plan 7,193 0 4,659 (227) 2,761                    
Cash dividends paid on common stock (44,569)     (44,569)                      
Ending balance, net of tax at Dec. 31, 2021 912,172 47,461 780,501 179,813 (155,308) 59,705                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Net income 105,020     105,020                      
Other comprehensive income (loss) (197,161)         (197,161)                  
Issuance of common stock for dividend reinvestment plan 1,233 40 1,193                        
Purchase of common stock (33,841)       (33,841)                    
Stock compensation expense 3,221   3,221                        
Net issuance of common stock under employee stock plan 289 0 (370) (287) 946                    
Cash dividends paid on common stock (44,936)     (44,936)                      
Ending balance, net of tax at Dec. 31, 2022 $ 745,997 $ 47,501 $ 784,545 $ 239,610 $ (188,203) $ (137,456)