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Investments - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
security
Jun. 30, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Accrued interest receivable $ 658,000 $ 658,000    
Write off on the accrued interest receivable $ 0 $ 0    
Number of securities in an unrealized loss position | security 19 19    
Fair value of unrealized loss positions $ 106,726,000 $ 106,726,000    
Unrealized losses of unrealized loss positions 41,000 41,000    
Allowance for expected credit losses 0 0 $ 0  
Total other investments at fair value 162,105,000 162,105,000   $ 0
Proceeds from sales of fixed maturities  7,312,000 7,312,000 $ 0  
Investments in direct lending entities        
Debt Securities, Available-for-sale [Line Items]        
Total other investments at fair value $ 49,978,000 $ 49,978,000