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Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
Beginning balance, shares at Dec. 31, 2023   29,511,721        
Beginning balance at Dec. 31, 2023 $ 839,208 $ 157,784 $ 301,066 $ 474,691 $ (50,646) $ (43,687)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 56,990     56,990    
Other comprehensive income         9,023  
Other comprehensive income, net of income tax 9,023          
Cash dividends declared (18,454)     (18,454)    
Stock-based compensation 3,137   3,426 (289)    
Stock issued under dividend reinvestment and employee stock purchase plans, shares   81,133        
Stock issued under dividend reinvestment and employee stock purchase plans 1,855   69     1,786
Vesting of restricted stock unit awards, shares   107,615        
Vesting of restricted stock units, net of shares withheld to cover taxes (859)   (3,219)     2,360
Shares under option, exercised   44,840        
Exercise of stock options 877   (80)     957
Purchases of treasury stock, shares   (664,201)        
Purchases of treasury stock (14,706)         (14,706)
Ending balance, shares at Sep. 30, 2024   29,081,108        
Ending balance at Sep. 30, 2024 877,071 $ 157,784 301,262 512,938 (41,623) (53,290)
Beginning balance, shares at Jun. 30, 2024   29,190,640        
Beginning balance at Jun. 30, 2024 854,137 $ 157,784 300,166 500,482 (54,124) (50,171)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 18,578     18,578    
Other comprehensive income         12,501  
Other comprehensive income, net of income tax 12,501          
Cash dividends declared (6,122)     (6,122)    
Stock-based compensation 1,078   1,078 0    
Stock issued under dividend reinvestment and employee stock purchase plans, shares   21,906        
Stock issued under dividend reinvestment and employee stock purchase plans 587   57     530
Vesting of restricted stock unit awards, shares   238        
Vesting of restricted stock units, net of shares withheld to cover taxes (2)   (7)     5
Shares under option, exercised   25,052        
Exercise of stock options 504   (32)     536
Purchases of treasury stock, shares   (156,728)        
Purchases of treasury stock (4,190)         (4,190)
Ending balance, shares at Sep. 30, 2024   29,081,108        
Ending balance at Sep. 30, 2024 877,071 $ 157,784 301,262 512,938 (41,623) (53,290)
Beginning balance, shares at Dec. 31, 2024   29,045,877        
Beginning balance at Dec. 31, 2024 887,301 $ 157,784 302,829 525,780 (43,992) (55,100)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 68,012     68,012    
Other comprehensive income         12,356  
Other comprehensive income, net of income tax 12,356          
Cash dividends declared (18,766)     (18,766)    
Stock-based compensation 3,066   3,376 (310)    
Stock issued under dividend reinvestment and employee stock purchase plans, shares   57,734        
Stock issued under dividend reinvestment and employee stock purchase plans 1,732   146 (1)   1,587
Vesting of restricted stock unit awards, shares   109,262        
Vesting of restricted stock units, net of shares withheld to cover taxes $ (1,597)   (3,689)     2,092
Shares under option, exercised 13,000 13,000        
Exercise of stock options $ 323   34     289
Purchases of treasury stock, shares   (649,527)        
Purchases of treasury stock (19,208)         (19,208)
Ending balance, shares at Sep. 30, 2025   28,576,346        
Ending balance at Sep. 30, 2025 933,219 $ 157,784 302,696 574,715 (31,636) (70,340)
Beginning balance, shares at Jun. 30, 2025   28,810,805        
Beginning balance at Jun. 30, 2025 916,733 $ 157,784 301,640 555,403 (34,969) (63,125)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 25,639     25,639    
Other comprehensive income         3,333  
Other comprehensive income, net of income tax 3,333          
Cash dividends declared (6,325)     (6,325)    
Stock-based compensation 1,039   1,041 (2)    
Stock issued under dividend reinvestment and employee stock purchase plans, shares   19,617        
Stock issued under dividend reinvestment and employee stock purchase plans 583   48 0   535
Vesting of restricted stock unit awards, shares   934        
Vesting of restricted stock units, net of shares withheld to cover taxes (15)   (33)     18
Purchases of treasury stock, shares   (255,010)        
Purchases of treasury stock (7,768)         (7,768)
Ending balance, shares at Sep. 30, 2025   28,576,346        
Ending balance at Sep. 30, 2025 $ 933,219 $ 157,784 $ 302,696 $ 574,715 $ (31,636) $ (70,340)