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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common stock
Retained earnings
AOCI
Beginning balance (in shares) at Dec. 31, 2021   35,105,779    
Beginning balance at Dec. 31, 2021 $ 854,432 $ 551,798 $ 293,238 $ 9,396
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock units vested (in shares)   124,839    
Restricted stock units vested      
Stock-based compensation expense 2,797 $ 2,797    
Twelfth Stock Repurchase Plan, Common Stock, Repurchased Shares (in shares)   (126,370)    
Common stock repurchased (3,176) $ (3,176)    
Net income 59,331   59,331  
Other comprehensive loss, net of tax (114,397)     (114,397)
Cash dividends declared on common stock 22,285   22,285  
Ending balance (in shares) at Sep. 30, 2022   35,104,248    
Ending balance at Sep. 30, 2022 776,702 $ 551,419 330,284 (105,001)
Beginning balance (in shares) at Jun. 30, 2022   35,103,929    
Beginning balance at Jun. 30, 2022 805,366 $ 550,417 316,732 (61,783)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock units vested (in shares)   419    
Restricted stock units vested      
Stock-based compensation expense 1,004 $ 1,004    
Twelfth Stock Repurchase Plan, Common Stock, Repurchased Shares (in shares)   (100)    
Common stock repurchased (2) $ (2)    
Net income 20,990   20,990  
Other comprehensive loss, net of tax (43,218)     (43,218)
Cash dividends declared on common stock 7,438   7,438  
Ending balance (in shares) at Sep. 30, 2022   35,104,248    
Ending balance at Sep. 30, 2022 $ 776,702 $ 551,419 330,284 (105,001)
Beginning balance (in shares) at Dec. 31, 2022 35,106,697 35,106,697    
Beginning balance at Dec. 31, 2022 $ 797,893 $ 552,397 345,346 (99,850)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock units vested (in shares)   156,370    
Restricted stock units vested      
Stock-based compensation expense 3,204 $ 3,204    
Twelfth Stock Repurchase Plan, Common Stock, Repurchased Shares (in shares)   (361,991)    
Common stock repurchased (6,949) $ (6,949)    
Net income 55,522   55,522  
Other comprehensive loss, net of tax (12,778)     (12,778)
Cash dividends declared on common stock $ 23,346   23,346  
Ending balance (in shares) at Sep. 30, 2023 34,901,076 34,901,076    
Ending balance at Sep. 30, 2023 $ 813,546 $ 548,652 377,522 (112,628)
Beginning balance (in shares) at Jun. 30, 2023   35,047,800    
Beginning balance at Jun. 30, 2023 819,733 $ 550,103 367,085 (97,455)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Restricted stock units vested (in shares)   1,730    
Restricted stock units vested      
Stock-based compensation expense 1,120 $ 1,120    
Twelfth Stock Repurchase Plan, Common Stock, Repurchased Shares (in shares)   (148,454)    
Common stock repurchased (2,571) $ (2,571)    
Net income 18,219   18,219  
Other comprehensive loss, net of tax (15,173)     (15,173)
Cash dividends declared on common stock $ 7,782   7,782  
Ending balance (in shares) at Sep. 30, 2023 34,901,076 34,901,076    
Ending balance at Sep. 30, 2023 $ 813,546 $ 548,652 $ 377,522 $ (112,628)