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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 18, 2023
Stockholders' Equity [Abstract]          
Unrecognized prior service cost and net actuarial (losses) on pension plans $ (18,103) $ (18,103) $ (21,983) $ (26,435)  
Unrealized net holding (losses) on AFS securities (123,995) (123,995) (138,951) (163,599)  
AOCI (142,098) $ (142,098) $ (160,934) $ (190,034)  
Preceding period of retained net profits for approval of Office of Comptroller of the Currency   2 years      
Statutory amount available for dividend payments $ 107,600 $ 107,600      
Stock Repurchase Program [Abstract]          
Purchase of common stock (in shares) 0 7,600 155,500 400,000  
Purchase of common stock value   $ 251 $ 4,944 $ 14,713  
Average price per share (in dollars per share)   $ 33.02      
Number of shares authorized under stock repurchase program (in shares)         2,000,000
Number of shares available for repurchase under stock repurchase program (in shares) 1,992,400 1,992,400