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Investments - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Issue
issuer
loan
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Issue
issuer
loan
security
Sep. 30, 2024
USD ($)
security
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
loan
Issue
issuer
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]                
Unfunded commitments $ 471,000   $ 471,000          
Fixed maturity, portfolio issues | Issue 2,584   2,584     2,552    
Fixed portfolio, number of issuers | issuer 1,012   1,012     1,014    
Non-accrual status with an amortized cost $ 18,948,357   $ 18,948,357     $ 18,835,809    
Debt securities allowance for credit loss $ 10,415 $ 7,132 $ 10,415 $ 7,132 $ 10,355 10,395 $ 7,132 $ 7,115
Number of loans | loan 36   36          
Carrying value $ 457,531   $ 457,531     403,732    
Provision (reversal) for credit losses 404 1,376 266 3,530        
Increase (decrease) in allowance for credit losses     (2,000)          
Allowance for credit losses 5,633 $ 7,202 5,633 $ 7,202 $ 6,629 7,644 $ 5,826 $ 3,672
Mortgage loans $ 451,898   $ 451,898     $ 396,088    
Commercial Portfolio Segment                
Debt Securities, Available-for-sale [Line Items]                
Number of loans removed form evaluation as a result of foreclosure | loan 2   4          
Outstanding principal value of loans removed form evaluation as a result of foreclosure $ 40,600   $ 45,800          
Commercial Portfolio Segment | Unfunded Loan Commitment                
Debt Securities, Available-for-sale [Line Items]                
Mortgage loans $ 23,000   $ 23,000          
Commercial Portfolio Segment | Loans In Process Of Foreclosure                
Debt Securities, Available-for-sale [Line Items]                
Number of loans | loan 0   0          
Senior Loans on Non Accrual Status                
Debt Securities, Available-for-sale [Line Items]                
Number of fixed maturities securities | security     2 0        
Non-accrual status with an amortized cost $ 16,000   $ 16,000          
Debt securities allowance for credit loss $ 10,000   $ 10,000          
Collaterally Dependent Loans | Commercial Portfolio Segment                
Debt Securities, Available-for-sale [Line Items]                
Number of loans | loan 2   2          
Carrying value $ 8,200   $ 8,200          
Provision (reversal) for credit losses     $ 1,600          
Nonaccrual Loans | Commercial Portfolio Segment                
Debt Securities, Available-for-sale [Line Items]                
Number of loans | loan 1   1     5    
Outstanding principal on nonaccrual loan $ 7,000   $ 7,000     $ 53,000    
Fixed maturities available for sale                
Debt Securities, Available-for-sale [Line Items]                
Unfunded commitments 263,000   263,000     $ 167,000    
Investment in Limited Partnerships                
Debt Securities, Available-for-sale [Line Items]                
Unfunded commitments $ 470,834   470,834          
Capital called from investment funds     $ 127,000