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Supplementary Information for Property Casualty Underwriters (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Information For Property Casualty Insurance Underwriters [Abstract]      
Deferred Policy Acquisition Costs $ 70,677 $ 61,676 $ 61,647
Reserves for Unpaid Claims and Claim Adjustment Expenses 630,181 680,031 634,664
Discount If Any Deducted 400 800 1,200
Unearned Premiums 314,861 281,912 285,397
Earned Premiums 525,262 467,775 438,034
Net Investment Income 42,052 46,342 39,323
Claims and Claim Adjustment Expense Incurred Related To Current Year 308,211 363,423 323,112
Claims and Claim Adjustment Expense Incurred Related To Prior Year (32,809) (28,798) (53,900)
Amortization Of Deferred Policy Acquisition Costs 132,329 117,988 108,964
Paid Claims and Claim Adjustment Expenses 292,183 301,357 271,756
Premiums Written $ 562,089 $ 472,547 $ 450,180