Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - Reclassification Out of Accumulated Other Comprehensive Loss [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Amortization of pension and postretirement benefit items:
Net income	$ 381	$ 148	$ 1,141	$ 443
Amortization of Net Actuarial Gain [Member]
Amortization of pension and postretirement benefit items:
Salaries and employee benefits	517	203	1,551	608
Amortization of Prior Service Cost [Member]
Amortization of pension and postretirement benefit items:
Salaries and employee benefits	(2)	(4)	(9)	(10)
Amortization of Pension and Postretirement Benefit Items [Member]
Amortization of pension and postretirement benefit items:
Income tax benefit	(134)	(51)	(401)	(155)
Net income	$ 381	$ 148	$ 1,141	$ 443