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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stockholders' Equity [Abstract]      
Unrecognized prior service cost and net actuarial (losses) on pension plans $ (21,983) $ (26,435) $ (16,269)
Unrealized net holding (losses) on AFS securities (138,951) (163,599) (7,075)
AOCI $ (160,934) $ (190,034) $ (23,344)
Preceding period of retained net profits for approval of Office of Comptroller of the Currency 2 years    
Statutory amount available for dividend payments $ 106,600    
Stock Repurchase Program [Abstract]      
Purchase of common stock (in shares) 155,500 400,000 604,637
Purchase of common stock value $ 4,944 $ 14,713 $ 21,714
Average price per share (in dollars per share) $ 31.79    
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) 2,000,000