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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) $ (254,806) $ (308,030)
Unrealized Loss on Securities Available for Sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (331,538) (400,720)
Deferred tax asset 76,751 92,767
Total accumulated other comprehensive income (loss) (254,787) (307,953)
Postretirement Plans Asset (Liability)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (25) (100)
Deferred tax asset 6 23
Total accumulated other comprehensive income (loss) $ (19) $ (77)