Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (141,250)	$ (126,630)	$ (139,974)	$ (2,426)
Change in Other comprehensive income (loss) before reclassification, Unrealized gains and Losses on available-for-sale Securities	(34,934)	(41,060)	(36,504)	(165,889)
Amount reclassified from accumulated other comprehensive income, unrealized gain and losses and available for sale securities	146	315	440	940
Net current period other comprehensive income (loss)	(34,788)	(40,745)	(36,064)	(164,949)
Ending balance	(176,038)	(167,375)	(176,038)	(167,375)
Unrealized gains and (Losses) on available- for-sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(130,466)	(109,159)	(128,896)	15,674
Change in Other comprehensive income (loss) before reclassification, Unrealized gains and Losses on available-for-sale Securities	(34,934)	(41,060)	(36,504)	(165,889)
Amount reclassified from accumulated other comprehensive income, unrealized gain and losses and available for sale securities				(4)
Net current period other comprehensive income (loss)	(34,934)	(41,060)	(36,504)	(165,893)
Ending balance	(165,400)	(150,219)	(165,400)	(150,219)
Retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(10,784)	(17,471)	(11,078)	(18,100)
Amount reclassified from accumulated other comprehensive income, unrealized gain and losses and available for sale securities	146	315	440	944
Net current period other comprehensive income (loss)	146	315	440	944
Ending balance	$ (10,638)	$ (17,156)	$ (10,638)	$ (17,156)