Accumulated Other Comprehensive (Loss) Income - Schedule of Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	$ (341,975)	$ (24,970)
Unrealized Gain (Loss) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	(444,063)	(32,067)	$ 20,448
Deferred tax asset (liability)	102,046	7,369	(4,699)
Total accumulated other comprehensive income (loss)	(342,017)	(24,698)	15,749
Postretirement Plans (Liability) Asset
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	54	(353)	(1,817)
Deferred tax asset (liability)	(12)	81	418
Total accumulated other comprehensive income (loss)	42	(272)	(1,399)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	$ (341,975)	$ (24,970)	$ 14,350