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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Voting and Nonvoting Common Stock
Common Stock
Voting and Nonvoting Common Stock
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Balance, beginning of period at Dec. 31, 2021 $ 380,338     $ 218,946 $ 172,431   $ (11,039)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 29,190       29,190    
Other comprehensive income (loss) (28,104)           (28,104)
Dividends declared (1,744)       (1,744)    
Recognition of the fair value of share-based compensation 1,967     1,967      
Repurchased shares of common stock (462,525) (20,626)     (20,626)      
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units 15     15      
Common stock redeemed for the net settlement of share-based awards (179)     (179)      
Balance, end of period at Sep. 30, 2022 $ 360,857     200,123 199,877   (39,143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Repurchased shares of common stock (in shares) (518,167)            
Balance, beginning of period at Jun. 30, 2022 $ 365,332     204,071 192,011   (30,750)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 8,436       8,436    
Other comprehensive income (loss) (8,393)           (8,393)
Dividends declared (570)       (570)    
Recognition of the fair value of share-based compensation 434     434      
Repurchased shares of common stock (462,525) (4,387)     (4,387)      
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units 5     5      
Balance, end of period at Sep. 30, 2022 $ 360,857     200,123 199,877   (39,143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Repurchased shares of common stock (in shares) (120,000)            
Balance, beginning of period at Dec. 31, 2022 $ 364,974 $ (4,491)   192,935 205,675 $ (4,491) (33,636)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2016-13 [Member]            
Balance, end of period at Jun. 30, 2023 $ 354,332     186,545 200,973   (33,186)
Balance, beginning of period at Dec. 31, 2022 364,974 $ (4,491)   192,935 205,675 $ (4,491) (33,636)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 4,274       4,274    
Other comprehensive income (loss) (7,561)           (7,561)
Dividends declared (1,602)       (1,602)    
Recognition of the fair value of share-based compensation 873     873      
Repurchased shares of common stock (462,525) (8,535)     (8,535)      
Excise tax on repurchase of common stock 85   $ 85        
Deferred stock rights and restricted stock units issued in lieu of cash dividends payable on outstanding deferred stock rights and restricted stock units 3     3      
Common stock redeemed for the net settlement of share-based awards (106)     (106)      
Balance, end of period at Sep. 30, 2023 $ 347,744     185,085 203,856   (41,197)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Repurchased shares of common stock (in shares) (462,525)            
Balance, beginning of period at Jun. 30, 2023 $ 354,332     186,545 200,973   (33,186)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 3,409       3,409    
Other comprehensive income (loss) (8,011)           (8,011)
Dividends declared (526)       (526)    
Recognition of the fair value of share-based compensation 386     386      
Repurchased shares of common stock (462,525) (1,828)     (1,828)      
Excise tax on repurchase of common stock (18)   $ (18)        
Balance, end of period at Sep. 30, 2023 $ 347,744     $ 185,085 $ 203,856   $ (41,197)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Repurchased shares of common stock (in shares) (97,834)