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Schedule VI. Supplemental Information Concerning Property-Casualty Insurance Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |  |  |
Deferred Policy Acquisition Costs | $ 17,975 | $ 17,401 | $ 17,059
Reserves for Unpaid Loss and Loss Adjustment Expense | 673,994 | 696,037 | 745,278
Unearned Premium | 116,585 | 114,976 | 121,092
Net Premiums Earned | 267,125 | 271,698 | 275,993
Net Investment Income | 31,339 | 27,223 | 25,435
Loss and LAE Related to Current Period | 189,659 | 192,907 | 222,715
Loss and LAE Related to Prior Periods | (41,396) | (40,591) | (61,917)
Amortization of Deferred Policy Acquisition Costs | (40,859) | (39,852) | (38,481)
Paid Claims and Claim Adjustment Expenses | 177,497 | 194,846 | 189,640
Net Premiums Written | $ 268,734 | $ 265,583 | $ 267,825

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- Definition Amount of amortization expense on deferred policy acquisition cost for property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column I)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-3 + Details
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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Amount of deferred policy acquisition cost related to property-casualty insurance policy written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-3 + Details
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- Definition Amount of net investment income earned by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column G)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-3 + Details
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- Definition Amount of loss reported and paid for claim and claim adjustment expense by property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column J)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-3 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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