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Schedule VI. Supplemental Information Concerning Property-Casualty Insurance Operations (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 $ 19,048 $ 19,734 $ 20,251
Reserves for Unpaid Loss and Loss Adjustment Expense 772,887 798,409 771,845
Unearned Premium 140,873 149,296 157,270
Net Premiums Earned 332,888 350,326 346,156
Net Investment Income 32,483 30,452 29,281
Loss and LAE Related to Current Period 241,344 250,487 244,094
Loss and LAE Related to Prior Periods (65,002) (45,596) (34,770)
Amortization of Deferred Policy Acquisition Costs (44,558) (45,769) (43,009)
Paid Claims and Claim Adjustment Expenses 189,991 200,654 186,888
Net Premiums Written $ 324,465 $ 342,352 $ 341,398