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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) $ (321,973) $ (308,030)
Unrealized Loss on Securities Available for Sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (418,888) (400,720)
Deferred tax asset 96,973 92,767
Total accumulated other comprehensive income (loss) (321,915) (307,953)
Postretirement Plans Asset (Liability)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (75) (100)
Deferred tax asset 17 23
Total accumulated other comprehensive income (loss) $ (58) $ (77)