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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 6,577	$ 59,698	$ 2,846	$ 64,771
Additions for credit losses not previously recorded	295	0	4,456	816
Change in allowance on securities with previous allowance	(257)	176	(687)	797
Reduction for securities sold during the period	(428)	(44,248)	(428)	(50,758)
Recoveries of amounts previously written off	0	(1,436)	0	(1,436)
Ending balance	6,187	14,190	6,187	14,190
States, Municipalities and Territories
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,009	2,791	2,776	2,844
Additions for credit losses not previously recorded	0	0	0	0
Change in allowance on securities with previous allowance	(175)	556	(942)	503
Reduction for securities sold during the period	0	0	0	0
Recoveries of amounts previously written off	0	0	0	0
Ending balance	1,834	3,347	1,834	3,347
Corporate Securities
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,825	55,715	0	60,193
Additions for credit losses not previously recorded	0	0	3,825	705
Change in allowance on securities with previous allowance	(82)	(402)	(82)	925
Reduction for securities sold during the period	0	(44,248)	0	(50,758)
Recoveries of amounts previously written off	0	(342)	0	(342)
Ending balance	3,743	10,723	3,743	10,723
Residential Mortgage Backed Securities
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	743	1,192	70	1,734
Additions for credit losses not previously recorded	295	0	631	111
Change in allowance on securities with previous allowance	0	22	337	(631)
Reduction for securities sold during the period	(428)		(428)	0
Recoveries of amounts previously written off	0	(1,094)	0	(1,094)
Ending balance	$ 610	$ 120	$ 610	$ 120

X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from recovery.

+ References

No definition available.

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X

- Definition

Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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- Definition

Amount, excluding accrued interest, of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with no credit loss previously recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with previously recorded allowance and not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455

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