Investments - Mortgage Loans Held for Sale (Details) $ in Thousands	Sep. 30, 2023 USD ($) state investment	Dec. 31, 2022 USD ($)
Gain (Loss) on Securities [Line Items]
Mortgage loans held for sale—at fair value \| $	$ 138,289	$ 3,549
Mortgage loans held for sale
Gain (Loss) on Securities [Line Items]
Number of investments \| investment	331
Unpaid principal balance \| $	$ 139,000
Number of states \| state	35
Mortgage loans held for sale \| Financial Asset, Equal to or Greater than 90 Days Past Due
Gain (Loss) on Securities [Line Items]
Number of investments \| investment	0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-9

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