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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Beginning balance | $ 2,846 | $ 64,771
Additions for credit losses not previously recorded | 4,161 | 816
Change in allowance on securities with previous allowance | (430) | 621
Reduction for securities sold during the period | 0 | (6,510)
Ending balance | 6,577 | 59,698
United States Municipalities, States and Territories |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 2,776 | 2,844
Additions for credit losses not previously recorded | 0 | 0
Change in allowance on securities with previous allowance | (767) | (53)
Reduction for securities sold during the period | 0 | 0
Ending balance | 2,009 | 2,791
Corporate Securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 0 | 60,193
Additions for credit losses not previously recorded | 3,825 | 705
Change in allowance on securities with previous allowance | 0 | 1,327
Reduction for securities sold during the period | 0 | (6,510)
Ending balance | 3,825 | 55,715
Commercial Mortgage Backed Securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 0 | 0
Additions for credit losses not previously recorded | 0 | 0
Change in allowance on securities with previous allowance | 0 | 0
Reduction for securities sold during the period | 0 | 0
Ending balance | 0 | 0
Residential Mortgage Backed Securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 70 | 1,734
Additions for credit losses not previously recorded | 336 | 111
Change in allowance on securities with previous allowance | 337 | (653)
Reduction for securities sold during the period | 0 | 0
Ending balance | 743 | 1,192
Other Asset Backed Securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 0 | 0
Additions for credit losses not previously recorded | 0 | 0
Change in allowance on securities with previous allowance | 0 | 0
Reduction for securities sold during the period | 0 | 0
Ending balance | $ 0 | $ 0

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- Definition Amount 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 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of expense 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), for which no credit loss was 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 http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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