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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,565,652	$ 1,328,439	$ 1,443,006	$ 1,217,317
Other Comprehensive Income (Loss) Before Reclassifications, net of tax	1,233	(292)	989	(274)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(17)	585	(158)	533
Total Other Comprehensive Income (Loss)	1,216	293	831	259
Ending balance	1,633,331	1,402,929	1,633,331	1,402,929
Pension and Other Postretirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,271	1,281	1,375	1,334
Other Comprehensive Income (Loss) Before Reclassifications, net of tax	0	(275)	0	(275)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(28)	585	(132)	532
Total Other Comprehensive Income (Loss)	(28)	310	(132)	257
Ending balance	1,243	1,591	1,243	1,591
Net Unrealized Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(508)	(400)	(227)	(419)
Other Comprehensive Income (Loss) Before Reclassifications, net of tax	1,233	(17)	989	1
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	11	0	(26)	1
Total Other Comprehensive Income (Loss)	1,244	(17)	963	2
Ending balance	736	(417)	736	(417)
Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	763	881	1,148	915
Total Other Comprehensive Income (Loss)	1,216	293	831	259
Ending balance	$ 1,979	$ 1,174	$ 1,979	$ 1,174

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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