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Income Taxes - Schedule of Company's Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Deferred income tax assets: |  |
Discounting of net unpaid loss and loss adjustment expenses | $ 16,164 | $ 18,018
Unearned premiums | 6,173 | 6,560
Accrued expenses and other | 2,403 | 2,385
State income tax | 2,468 | 2,135
Accrued policyholder dividends | 1,841 | 1,989
Accrued insurance-related assessments | 1,990 | 1,901
Net unrealized loss on securities | 1,182 |
Total deferred tax assets | 32,221 | 32,988
Deferred income tax liabilities: |  |
Deferred policy acquisition costs | (4,391) | (4,430)
Unrealized gain on securities available-for-sale |  | (7,791)
Property and equipment and other | (473) | (298)
Salvage and subrogation | (320) | (428)
Loss reserves adjustment | (4,243) | (5,657)
Total deferred income tax liabilities | (9,427) | (18,604)
Net deferred income taxes | $ 22,794 | $ 14,384

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