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Investments - Summary of Information Relating to Investments Measured at Fair Value for Company has Used Unobservable Inputs to Determine Fair Value (Parenthetical) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Transfers out of Level III | $ 13,988 | [1] | $ 13,819 | [2]
Transfers into Level III | 5,351 | [3] | 20,127 | [4]
Debt securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Transfers out of Level III | 13,988 | [1] | 13,819 | [2]
Transfers into Level III | 5,351 | [3] | $ 20,127 | [4]
Debt Securities and Equity Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Transfers out of Level III | $ 14,000 |  |  |
[1] | Transfers out of Level III represent a transfer of $14.0 million relating to debt securities and equity securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2022.
[2] | Transfers out of Level III represent a transfer of $13.8 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were observable as of September 30, 2021.
[3] | Transfers into Level III represent a transfer of $5.4 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2022.
[4] | Transfers into Level III represent a transfer of $20.1 million relating to debt securities for which pricing inputs, other than their quoted prices in active markets were unobservable as of September 30, 2021.

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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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