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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Common Stock
Paid In Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Beginning 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 24,996     24,996    
Other comprehensive income (loss) (139,976)         (139,976)
Issuance of common stock for dividend reinvestment plan 322 10 312      
Purchase of common stock (3,358)       (3,358)  
Stock compensation expense 819   819      
Net issuance of common stock under employee stock plans 269   182 (67) 154  
Cash dividends paid on common stock (11,003)     (11,003)    
Ending balance, net of tax at Mar. 31, 2022 784,241 47,471 781,814 193,739 (158,512) (80,271)
Beginning 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 77,352          
Other comprehensive income (loss) (240,395)          
Ending balance, net of tax at Sep. 30, 2022 707,636 47,490 783,803 224,142 (167,109) (180,690)
Beginning balance, net of tax at Mar. 31, 2022 784,241 47,471 781,814 193,739 (158,512) (80,271)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 25,405     25,405    
Other comprehensive income (loss) (59,064)         (59,064)
Issuance of common stock for dividend reinvestment plan 313 10 303      
Purchase of common stock (8,842)       (8,842)  
Stock compensation expense 847   847      
Net issuance of common stock under employee stock plans (212)   (453) (67) 308  
Cash dividends paid on common stock (10,906)     (10,906)    
Ending balance, net of tax at Jun. 30, 2022 731,782 47,481 782,511 208,171 (167,046) (139,335)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 26,951     26,951    
Other comprehensive income (loss) (41,355)         (41,355)
Issuance of common stock for dividend reinvestment plan 278 9 269      
Purchase of common stock (309)       (309)  
Stock compensation expense 760   760      
Net issuance of common stock under employee stock plans 448   263 (61) 246  
Cash dividends paid on common stock (10,919)     (10,919)    
Ending balance, net of tax at Sep. 30, 2022 707,636 47,490 783,803 224,142 (167,109) (180,690)
Beginning balance, net of tax at Dec. 31, 2022 745,997 47,501 784,545 239,610 (188,203) (137,456)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 26,034     26,034    
Other comprehensive income (loss) 4,144         4,144
Issuance of common stock for dividend reinvestment plan 302 10 292      
Purchase of common stock (15,945)       (15,945)  
Stock compensation expense 914   914      
Net issuance of common stock under employee stock plans 572   368 (91) 295  
Cash dividends paid on common stock (10,988)     (10,988)    
Ending balance, net of tax at Mar. 31, 2023 751,030 47,511 786,119 254,565 (203,853) (133,312)
Beginning balance, net of tax at Dec. 31, 2022 745,997 47,501 784,545 239,610 (188,203) (137,456)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 69,376          
Other comprehensive income (loss) (17,521)          
Ending balance, net of tax at Sep. 30, 2023 728,595 47,537 788,190 276,312 (228,467) (154,977)
Beginning balance, net of tax at Mar. 31, 2023 751,030 47,511 786,119 254,565 (203,853) (133,312)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 24,893     24,893    
Other comprehensive income (loss) 17,619         17,619
Issuance of common stock for dividend reinvestment plan 299 13 286      
Purchase of common stock (18,725)       (18,725)  
Stock compensation expense 924   924      
Net issuance of common stock under employee stock plans (159)   (302) (95) 238  
Cash dividends paid on common stock (10,720)     (10,720)    
Ending balance, net of tax at Jun. 30, 2023 765,161 47,524 787,027 268,643 (222,340) (115,693)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 18,449     18,449    
Other comprehensive income (loss) (39,284)         (39,284)
Issuance of common stock for dividend reinvestment plan 307 13 294      
Purchase of common stock (6,237)       (6,237)  
Stock compensation expense 875   875      
Net issuance of common stock under employee stock plans 11   (6) (93) 110  
Cash dividends paid on common stock (10,687)     (10,687)    
Ending balance, net of tax at Sep. 30, 2023 $ 728,595 $ 47,537 $ 788,190 $ 276,312 $ (228,467) $ (154,977)