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Consolidated Balance Sheets (Parenthetical) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Statement Of Financial Position [Abstract] |  |  |
Fixed maturity securities, held-to-maturity, allowance for credit losses | $ 274,000 | $ 0 |
Fixed maturity securities, fair value | 621,654,000 | 621,343,000 |
Fixed maturity securities, available-for-sale, allowance for credit losses | 0 | 0 |
Fixed maturity securities, amortized cost | 387,665,000 | 425,698,000 |
Amounts recoverable from reinsurers, allowance for credit losses | 452,000 | 0 |
Premiums receivable, allowance for credit losses | 4,791,000 | 5,112,000 | $ 5,390,000
Equity securities, cost | $ 35,787,000 | $ 24,457,000 |
Common stock, par value | $ 0.01 | $ 0.01 |
Common stock, shares authorized | 50,000,000 | 50,000,000 |
Common stock, shares issued | 20,589,309 | 20,560,833 |
Common stock, shares outstanding | 19,331,059 | 19,302,583 |
Treasury stock, shares | 1,258,250 | 1,258,250 |

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