v3.26.1
Investments - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]      
Gross unrealized gain (loss) on available for sale securities $ 8,500,000   $ 8,400,000
Gross realized gains from sales of available-for-sale debt securities 4,000 $ 5,000  
Gross realized losses from sales of available-for-sale debt securities 5,000 2,000  
Proceeds from sale of available-for-sale debt securities 344,000 24,500,000  
Amount payable for securities purchased 1,000   0
Amount receivable for securities sold 13,000   0
Gross unrealized gains 112,000   80,000
Gross unrealized losses 81,000   79,000
Proceeds from sales of short-term investments 39,300,000 24,700,000  
Purchases of short-term investments 65,400,000 62,400,000  
Other than temporary impairments losses, investments 0 $ 0  
Investments 250,000   250,000
Deposits held in trust accounts 8,500,000   8,500,000
Deposits, held in trust for collateral requirements 99,500,000   $ 98,800,000
Collateral of gross unearned premiums and gross loss reserves 98,700,000    
Unearned premiums run off $ 0    
Expected term 7 years    
Percentage of trust balances released in next few years 50.00%