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Fair Value of Financial Instruments - Carrying Value of Commercial Mortgage Loans and Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total amortized cost | $ 41,283 | $ 45,421
Allowance for mortgage loan losses | (45) | (55)
Mortgage loans, net | 41,238 | 45,366
Total mortgage loans | Mortgage Loans by Region |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 41,283 | $ 45,421
Percent of Total | 100.00% | 100.00%
Total mortgage loans | Mortgage Loans by Region | East North Central |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 3,245 | $ 3,245
Percent of Total | 7.90% | 7.10%
Total mortgage loans | Mortgage Loans by Region | Southern Atlantic |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 17,119 | $ 17,217
Percent of Total | 41.50% | 37.90%
Total mortgage loans | Mortgage Loans by Region | East South Central |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 7,393 | $ 7,526
Percent of Total | 17.90% | 16.60%
Total mortgage loans | Mortgage Loans by Region | New England |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 6,588 | $ 6,588
Percent of Total | 15.90% | 14.50%
Total mortgage loans | Mortgage Loans by Region | Middle Atlantic |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 2,102 | $ 5,979
Percent of Total | 5.10% | 13.20%
Total mortgage loans | Mortgage Loans by Region | Mountain |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 1,992 | $ 1,992
Percent of Total | 4.80% | 4.40%
Total mortgage loans | Mortgage Loans by Region | West North Central |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 2,844 | $ 2,874
Percent of Total | 6.90% | 6.30%
Total mortgage loans | Mortgage Loans by Property Type |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 41,283 | $ 45,421
Percent of Total | 100.00% | 100.00%
Total mortgage loans | Mortgage Loans by Property Type | Multifamily |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 8,448 | $ 8,507
Percent of Total | 20.50% | 18.70%
Total mortgage loans | Mortgage Loans by Property Type | Office |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 10,784 | $ 10,950
Percent of Total | 26.10% | 24.10%
Total mortgage loans | Mortgage Loans by Property Type | Industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 9,949 | $ 9,985
Percent of Total | 24.10% | 22.00%
Total mortgage loans | Mortgage Loans by Property Type | Retail |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 10,000 | $ 10,000
Percent of Total | 24.20% | 22.00%
Total mortgage loans | Mortgage Loans by Property Type | Mixed use/Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Mortgage loans, net | $ 2,102 | $ 5,979
Percent of Total | 5.10% | 13.20%
Less than 65% |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total amortized cost | $ 32,718 | $ 36,762
65%-75% |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total amortized cost | $ 8,565 | $ 8,659

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