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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022		$ (498,042)
Net current period OCI		67,693	$ (244,894)
Ending Balance, March 31, 2023		(430,349)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022		(295,197)
OCI before reclassifications		52,079
Amounts reclassified from AOCI		(4,822)
Net current period OCI		56,901
Ending Balance, March 31, 2023		(238,296)
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022		(417,035)
OCI before reclassifications		69,800
Amounts reclassified from AOCI		2,705
Net current period OCI		67,095
Ending Balance, March 31, 2023		(349,940)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022	[1]	(121,838)
OCI before reclassifications	[1]	17,721
Amounts reclassified from AOCI	[1]	7,527
Net current period OCI	[1]	10,194
Ending Balance, March 31, 2023	[1]	(111,644)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022		(81,007)
OCI before reclassifications		0
Amounts reclassified from AOCI		(598)
Net current period OCI		(598)
Ending Balance, March 31, 2023		(80,409)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022		(498,042)
OCI before reclassifications		69,800
Amounts reclassified from AOCI		2,107
Net current period OCI		67,693	$ (244,894)
Ending Balance, March 31, 2023		$ (430,349)
[1] 1Represents change in unrealized gains (losses) on securities with credit loss recognized in earnings.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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

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