Benefit Plans - Change in Accumulated Other Comprehensive Income (AOCI) and Expected Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Pension and Supplemental Executive Retirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI in Prior Year	$ 83,298	$ 97,911
Recognized during year - Prior Service (Cost)/Credit	745	239
Recognized during year - Net Actuarial (Losses)/Gains	(20,109)	(11,502)
Occurring during year - Prior Service Cost	3,247	2
Occurring during year - Net Actuarial Losses/(Gains)	25,775	(3,352)
AOCI in Current Year	92,956	83,298
Other Postretirement Benefit Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI in Prior Year	(44,891)	(27,892)
Recognized during year - Prior Service (Cost)/Credit	(489)	(213)
Recognized during year - Net Actuarial (Losses)/Gains	3,103	1,697
Occurring during year - Prior Service Cost	11,277	0
Occurring during year - Net Actuarial Losses/(Gains)	30,468	(18,483)
AOCI in Current Year	$ (532)	$ (44,891)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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