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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Statement Of Financial Position [Abstract] |  |
Fixed maturity securities, held-to-maturity, allowance for credit losses | $ 172 | $ 274
Fixed maturity securities, fair value | 569,445 | 621,654
Fixed maturity securities, available-for-sale, allowance for credit losses | 0 | 0
Fixed maturity securities, amortized cost | 322,863 | 387,665
Equity securities, cost | 40,674 | 35,787
Amounts recoverable from reinsurers, allowance for credit losses | 389 | 452
Premiums receivable, allowance for credit losses | $ 4,414 | $ 4,791
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 50,000,000 | 50,000,000
Common stock, shares issued | 20,622,304 | 20,589,309
Common stock, shares outstanding | 19,364,054 | 19,331,059
Treasury stock, shares | 1,258,250 | 1,258,250

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