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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Fixed maturity securities, held-to-maturity, allowance for credit losses | $ 274 | $ 0
Fixed maturity securities, fair value | 621,654 | 621,343
Fixed maturity securities, amortized cost | 387,665 | 425,698
Equity securities, cost | 35,787 | 24,457
Net of Treasury stock | 22,370 | 22,370
Parent Company [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Fixed maturity securities, held-to-maturity, allowance for credit losses | 0 | 0
Fixed maturity securities, fair value | 361 | 0
Fixed maturity securities, amortized cost | 7,210 | 7,210
Equity securities, cost | 10,007 | 10,007
Net of Treasury stock | $ 22,370 | $ 22,370

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