Benefit Plans - Change in Accumulated Other Comprehensive Income (AOCI) and Expected Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Pension and Supplemental Executive Retirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI in Prior Year	$ 97,911	$ 98,589
Recognized during year - Prior Service (Cost)/Credit	239	247
Recognized during year - Net Actuarial (Losses)/Gains	(11,502)	(16,948)
Occurring during year - Prior Service Cost	2	2
Occurring during year - Net Actuarial Losses/(Gains)	(3,352)	16,021
AOCI in Current Year	83,298	97,911
Other Postretirement Benefit Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI in Prior Year	(27,892)	(15,281)
Recognized during year - Prior Service (Cost)/Credit	(213)	(51)
Recognized during year - Net Actuarial (Losses)/Gains	1,697	782
Occurring during year - Prior Service Cost	0	0
Occurring during year - Net Actuarial Losses/(Gains)	(18,483)	(13,342)
AOCI in Current Year	$ (44,891)	$ (27,892)

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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