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Investments (Rollforward of Allowance for Credit Loss) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Additions for credit losses not previously recorded | $ 94,560
Reduction for securities with credit losses due to intent to sell | (22,436)
Reduction for securities sold during the period | (7,353)
Ending balance | 64,771
United States Municipalities, States and Territories |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Additions for credit losses not previously recorded | 2,844
Reduction for securities with credit losses due to intent to sell | 0
Reduction for securities sold during the period | 0
Ending balance | 2,844
Corporate Securities |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Additions for credit losses not previously recorded | 60,193
Reduction for securities with credit losses due to intent to sell | 0
Reduction for securities sold during the period | 0
Ending balance | 60,193
Commercial Mortgage Backed Securities |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Additions for credit losses not previously recorded | 29,241
Reduction for securities with credit losses due to intent to sell | (21,888)
Reduction for securities sold during the period | (7,353)
Ending balance | 0
Residential Mortgage Backed Securities |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Additions for credit losses not previously recorded | 1,734
Reduction for securities with credit losses due to intent to sell | 0
Reduction for securities sold during the period | 0
Ending balance | 1,734
Other Asset Backed Securities |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Additions for credit losses not previously recorded | 548
Reduction for securities with credit losses due to intent to sell | (548)
Reduction for securities sold during the period | 0
Ending balance | $ 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=118955579&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=118955579&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=118939692&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=118942338&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=118955579&loc=SL82922900-210455 + Details
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- Definition Amount 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 http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455 + Details
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