Benefit Plans - Change in Projected Benefit Obligation, Change in Fair Value of Plan Assets, and Funded Status of the Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 14,571
Projected benefit obligation at end of year	13,418	$ 14,571
Change in fair value of plan assets:
Fair value of plan assets at beginning of year	302,034
Fair value of plan assets at end of year	350,737	302,034
Funded status of the plan
Accumulated benefit obligation	13,418	14,571
Accrued interest receivable	986	826
Pension
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	179,918	175,496
Interest cost	8,542	8,923	$ 5,373
Actuarial (loss) gain	(6,017)	7,604
Benefits paid	(11,920)	(12,105)
Projected benefit obligation at end of year	170,523	179,918	175,496
Change in fair value of plan assets:
Fair value of plan assets at beginning of year	302,860	275,406
Actual return on plan assets	30,595	37,993
Employer contributions	30,188	1,566
Benefits paid	(11,920)	(12,105)
Fair value of plan assets at end of year	351,723	302,860	275,406
Funded status of the plan
Assets (liabilities) recognized	181,200	122,942
Accumulated benefit obligation	170,523	179,918
OPEB
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	5,451	5,981
Interest cost	245	279	174
Actuarial (loss) gain	178	(161)
Benefits paid	(721)	(648)
Projected benefit obligation at end of year	5,153	5,451	5,981
Change in fair value of plan assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	721	648
Benefits paid	(721)	(648)
Fair value of plan assets at end of year	0	0	$ 0
Funded status of the plan
Assets (liabilities) recognized	(5,153)	(5,451)
Accumulated benefit obligation	$ 5,153	$ 5,451