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Fair Value of Financial Instruments - Narrative (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, number of securities priced for fair value | security 1 1
Net unrealized losses on fixed maturity investments | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, securities valued using market approach $ 5,314 $ 5,382
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, fair value 431,624 409,706
Underwriting-related derivative liability 3,984  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, fair value 187,693 190,167
Underwriting-related derivative liability 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial instruments, fair value 57,994 52,483
Underwriting-related derivative liability 3,984 3,984
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Underwriting-related derivative liability $ 3,984 $ 3,984
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Net unrealized losses on fixed maturity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, valued by third party, percentage 98.00% 97.90%
Assets, valued using market approach, percentage 2.00% 2.10%