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Accumulated Other Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (loss) $ (308,030) $ (341,975)  
Unrealized Gain (Loss) on Securities Available for Sale      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (loss) (400,720) (444,063) $ (32,067)
Deferred tax asset (liability) 92,767 102,046 7,369
Total accumulated other comprehensive income (loss) (307,953) (342,017) (24,698)
Postretirement Plans (Liability) Asset      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (loss) (100) 54 (353)
Deferred tax asset (liability) 23 (12) 81
Total accumulated other comprehensive income (loss) (77) 42 (272)
Total      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total accumulated other comprehensive income (loss) $ (308,030) $ (341,975) $ (24,970)