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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022				$ (498,042)
Net current period OCI		$ (100,147)	$ (188,641)	(77,827)	$ (640,110)
Ending Balance, September 30, 2023		(575,869)		(575,869)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022				(295,197)
OCI before reclassifications				(76,219)
Amounts reclassified from AOCI				15,891
Net current period OCI				(60,328)
Ending Balance, September 30, 2023		(355,525)		(355,525)
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022				(417,035)
OCI before reclassifications				(89,251)
Amounts reclassified from AOCI				9,630
Net current period OCI				(79,621)
Ending Balance, September 30, 2023		(496,656)		(496,656)
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]			(13,032)
Amounts reclassified from AOCI	[1]			(6,261)
Net current period OCI	[1]			(19,293)
Ending Balance, September 30, 2023	[1]	(141,131)		(141,131)
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				1,794
Net current period OCI				1,794
Ending Balance, September 30, 2023		(79,213)		(79,213)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2022				(498,042)
OCI before reclassifications				(89,251)
Amounts reclassified from AOCI				11,424
Net current period OCI		(100,147)	$ (188,641)	(77,827)	$ (640,110)
Ending Balance, September 30, 2023		$ (575,869)		$ (575,869)
[1] 1Represents change in unrealized gains (losses) on securities with credit loss recognized in earnings.

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