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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) $ (400,752) $ (341,975)
Unrealized Loss on Securities Available for Sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (521,660) (444,063)
Deferred tax asset 120,765 102,046
Total accumulated other comprehensive income (loss) (400,895) (342,017)
Postretirement Plans Asset (Liability)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) 187 54
Deferred tax asset (44) (12)
Total accumulated other comprehensive income (loss) $ 143 $ 42