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, 2022	Dec. 31, 2021	Dec. 31, 2020
Funded status of the plan
Accrued interest receivable	$ 710	$ 783
Pension
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	180,204	190,849
Acquisition	49,008	0
Interest cost	5,373	3,510	$ 4,941
Actuarial loss	(48,109)	(5,418)
Benefits paid	(10,980)	(8,737)
Projected benefit obligation at end of year	175,496	180,204	190,849
Change in fair value of plan assets:
Fair value of plan assets at beginning of year	278,420	260,651
Actual return on plan assets	(47,029)	25,057
Employer contributions	1,562	1,449
Benefits paid	(10,980)	(8,737)
Fair value of plan assets at end of year	275,406	278,420	$ 260,651
Acquisition	53,433	0
Funded status of the plan
Assets (liabilities) recognized	99,910	98,216
Accumulated benefit obligation	175,496	180,204
OPEB
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	0
Acquisition	7,445
Interest cost	174
Actuarial loss	(975)
Benefits paid	(663)
Projected benefit obligation at end of year	5,981	0
Change in fair value of plan assets:
Fair value of plan assets at beginning of year	0
Actual return on plan assets	0
Employer contributions	663
Benefits paid	(663)
Fair value of plan assets at end of year	0	$ 0
Acquisition	0
Funded status of the plan
Assets (liabilities) recognized	(5,981)
Accumulated benefit obligation	$ 5,981