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Investment Information - Allowance for expected credit losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Allowance for expected credit losses |  |  |  |  |
Balance at beginning of period |  | $ 58,410 | $ 2,124 | $ 2,883 | $ 2,397
Additions for current-period provision for expected credit losses |  | 3,780 | 48 | 53,521 | 2,710
Additions (reductions) for previously recognized expected credit losses |  | (12,530) | 405 | (5,609) | (1,317)
Reductions due to disposals |  | (3,667) | (466) | (4,802) | (1,679)
Balance at end of period |  | 45,993 | 2,111 | 45,993 | 2,111
Structured securities |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |
Balance at beginning of period | [1] | 18,283 | 759 | 802 | 1,490
Additions for current-period provision for expected credit losses | [1] | 1,782 | 48 | 12,560 | 282
Additions (reductions) for previously recognized expected credit losses | [1] | (9,767) | 14 | (2,575) | (751)
Reductions due to disposals | [1] | (1,780) | (234) | (2,269) | (434)
Balance at end of period | [1] | 8,518 | 587 | 8,518 | 587
Municipal bonds |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |
Balance at beginning of period |  | 298 | 6 | 2 | 11
Additions for current-period provision for expected credit losses |  | 12 | 0 | 359 | 0
Additions (reductions) for previously recognized expected credit losses |  | (211) | (4) | (262) | (9)
Reductions due to disposals |  | 0 | 0 | 0 | 0
Balance at end of period |  | 99 | 2 | 99 | 2
Corporate bonds |  |  |  |  |
Allowance for expected credit losses |  |  |  |  |
Balance at beginning of period |  | 39,829 | 1,359 | 2,079 | 896
Additions for current-period provision for expected credit losses |  | 1,986 | 0 | 40,602 | 2,428
Additions (reductions) for previously recognized expected credit losses |  | (2,552) | 395 | (2,772) | (557)
Reductions due to disposals |  | (1,887) | (232) | (2,533) | (1,245)
Balance at end of period |  | $ 37,376 | $ 1,522 | $ 37,376 | $ 1,522
[1] | Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.

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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 https://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 https://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 https://asc.fasb.org/extlink&oid=126970911&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 https://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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for 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), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + 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 + 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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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