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Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2021				$ 115,099
Net current period OCI		$ (188,641)	$ (29,147)	(640,110)	$ (79,962)
Ending Balance, September 30, 2022		(525,011)		(525,011)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2021				185,170
OCI before reclassifications				(532,744)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent				(38,233)
Net current period OCI				(494,511)
Ending Balance, September 30, 2022		(309,341)		(309,341)
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2021				180,880
OCI before reclassifications				(712,547)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent				(71,449)
Net current period OCI				(641,098)
Ending Balance, September 30, 2022		(460,218)		(460,218)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2021	[1]			(4,287)
OCI before reclassifications	[1]			(179,803)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	[1]			(33,214)
Net current period OCI	[1]			(146,589)
Ending Balance, September 30, 2022	[1]	(150,876)		(150,876)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Held-to-maturity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2021				(3)
OCI before reclassifications				0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent				(2)
Net current period OCI				2
Ending Balance, September 30, 2022		(1)		(1)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2021				(65,781)
OCI before reclassifications				0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent				(988)
Net current period OCI				(988)
Ending Balance, September 30, 2022		(64,793)		(64,793)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2021				115,099
OCI before reclassifications				(712,547)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent				(72,437)
Net current period OCI		(188,641)	$ (29,147)	(640,110)	$ (79,962)
Ending Balance, September 30, 2022		$ (525,011)		$ (525,011)
[1] 1Represents change in unrealized loss on securities with credit loss recognized in earnings.

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