v3.26.1
Investments - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Gross unrealized gain (loss) on available for sale securities $ 8,400,000 $ 12,300,000
Proceeds from sale of available-for-sale debt securities 6,100,000 1,900,000
Gross realized gains from sales of available-for-sale debt securities 11,000 10,000
Gross realized losses from sales of available-for-sale debt securities 249,000 17,000
Gross unrealized gains 80,000 350,000
Gross unrealized losses 79,000 584,000
Amount payable for securities purchased 0 0
Amount receivable for securities sold 0 0
Proceeds from sales of short-term investments 186,000,000 124,700,000
Purchases of short-term investments 283,200,000 188,400,000
Other than temporary impairments losses, investments 0 0
Investments 250,000 250,000
Deposits held in trust accounts 8,500,000 8,300,000
Deposits, held in trust for collateral requirements 98,800,000 $ 108,400,000
Collateral of gross unearned premiums and gross loss reserves $ 98,000,000  
Expected term 7 years  
Percentage of trust balances released in next few years 50.00%  
Unearned premiums run off $ 0