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Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Net Realized Investment Gains (Losses) $ (3,822) $ (5,429) $ 1,274
Claims and Claim Adjustment Expenses Incurred Related to: Current Year 778,480 745,813 701,664
Claims and Claim Adjustment Expenses Incurred Related to: Prior Years 14,078 1,208 (67,750)
Consolidated Property and Casualty Insurance Entity      
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]      
Deferred Policy Acquisition Costs 158,184 147,224 126,532
Reserves for Unpaid Claims and Claim Adjustment Expenses 1,924,826 1,796,782 1,638,755
Unearned Premium 660,210 621,448 549,384
Earned Premium 1,292,696 1,176,750 1,034,587
Net Realized Investment Gains (Losses) (3,822) (5,429) 1,274
Net Investment Income 97,538 81,986 59,606
Claims and Claim Adjustment Expenses Incurred Related to: Current Year 778,480 745,813 701,664
Claims and Claim Adjustment Expenses Incurred Related to: Prior Years (14,078) (1,208) 67,750
Amortization of Deferred Policy Acquisition Costs 315,323 281,338 244,991
Paid Claims and Claim Adjustment Expenses 651,908 593,021 672,699
Written Premium $ 1,346,219 $ 1,231,470 $ 1,066,901