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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) $ (315,191) $ (308,030)
Unrealized Loss on Securities Available for Sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (410,088) (400,720)
Deferred tax asset 94,935 92,767
Total accumulated other comprehensive income (loss) (315,153) (307,953)
Postretirement Plans Asset (Liability)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (50) (100)
Deferred tax asset 12 23
Total accumulated other comprehensive income (loss) $ (38) $ (77)