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Supplementary Information for Property Casualty Underwriters (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]      
Deferred Policy Acquisition Costs $ 64,894 $ 60,331 $ 65,195
Reserves for Unpaid Claims and Claim Adjustment Expenses 832,404 759,904 662,811
Discount If Any Deducted 0 0 0
Unearned Premiums 269,353 316,566 291,495
Earned Premiums 602,471 595,610 567,699
Net Investment Income 27,627 37,020 28,392
Claims and Claim Adjustment Expense Incurred Related To Current Year 367,298 376,306 367,739
Claims and Claim Adjustment Expense Incurred Related To Prior Year (8,070) 8,658 (31,538)
Amortization Of Deferred Policy Acquisition Costs 150,946 144,944 140,908
Paid Claims and Claim Adjustment Expenses 265,306 300,156 309,456
Premiums Written $ 591,331 $ 580,068 $ 548,167