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INVESTMENTS - Mortgage Loans (Narrative) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
loan
Dec. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
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) 79.00% 78.00%        
Number of commercial mortgage loans, past due | loan 1          
Commercial mortgage loans, past due amount       $ 0    
Allowance for expected credit losses $ 27,335,000 $ 23,378,000 $ 25,862,000 $ 20,681,000 $ 8,113,000 $ 6,220,000
Sector Concentration | Mortgage Loans | Mortgage Loans            
Debt and Equity Securities, FV-NI [Line Items]            
Representation (as a percent) 49.00% 43.00%