Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	$ (358,036)	$ (24,970)
Unrealized Loss on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	(464,640)	(32,067)
Deferred tax asset	106,774	7,369
Total accumulated other comprehensive income (loss)	(357,866)	(24,698)
Postretirement Plans Asset (Liability)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	(221)	(353)
Deferred tax asset	51	81
Total accumulated other comprehensive income (loss)	$ (170)	$ (272)