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INVESTMENTS - Mortgage Loans (Narrative) (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) loan | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Weighted average debt service coverage ratios | 1.7 | 1.7 |  |
Weighted average loan-to-value ratios (as a percent) | 78.00% | 78.00% |  |
Number of commercial mortgage loans, past due | loan | 1 |  |  |
Commercial mortgage loans, past due amount |  |  | $ 0 |
Allowance for expected credit losses | $ 25,862,000 | $ 23,378,000 | $ 8,113,000 | $ 6,220,000
Sector Concentration | Mortgage Loans | Mortgage Loans |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Representation (as a percent) | 47.00% | 43.00% |  |

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