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Investments - Schedule of Commercial Mortgage Loan Participations Recorded Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | $ 451,898 |  | $ 396,088 |  |  |
Carrying value, gross | 457,531 |  | 403,732 |  |  |
Less allowance for credit losses | $ (5,633) | $ (6,629) | $ (7,644) | $ (7,202) | $ (5,826) | $ (3,672)
% of Gross Total | 100.00% |  | 100.00% |  |  |
Less than 70% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying value, gross | $ 449,301 |  | $ 349,868 |  |  |
% of Gross Total | 98.00% |  | 87.00% |  |  |
70% to 80% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying value, gross | $ 0 |  | $ 0 |  |  |
% of Gross Total | 0.00% |  | 0.00% |  |  |
81% to 90% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying value, gross | $ 0 |  | $ 0 |  |  |
% of Gross Total | 0.00% |  | 0.00% |  |  |
Greater than 90% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying value, gross | $ 8,230 |  | $ 53,864 |  |  |
% of Gross Total | 2.00% |  | 13.00% |  |  |
Less Than 1.00x |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | $ 69,100 |  | $ 104,643 |  |  |
Less Than 1.00x | Less than 70% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 60,870 |  | 88,507 |  |  |
Less Than 1.00x | 70% to 80% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 0 |  | 0 |  |  |
Less Than 1.00x | 81% to 90% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 0 |  | 0 |  |  |
Less Than 1.00x | Greater than 90% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 8,230 |  | 16,136 |  |  |
1.00x—1.20x |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 83,634 |  | 102,222 |  |  |
1.00x—1.20x | Less than 70% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 83,634 |  | 64,494 |  |  |
1.00x—1.20x | 70% to 80% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 0 |  | 0 |  |  |
1.00x—1.20x | 81% to 90% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 0 |  | 0 |  |  |
1.00x—1.20x | Greater than 90% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 0 |  | 37,728 |  |  |
Greater Than 1.20x |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 304,797 |  | 196,867 |  |  |
Greater Than 1.20x | Less than 70% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 304,797 |  | 196,867 |  |  |
Greater Than 1.20x | 70% to 80% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 0 |  | 0 |  |  |
Greater Than 1.20x | 81% to 90% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | 0 |  | 0 |  |  |
Greater Than 1.20x | Greater than 90% |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance for credit losses | $ 0 |  | $ 0 |  |  |

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