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Consolidated Balance Sheets (Parenthetical) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
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Statement Of Financial Position [Abstract] |  |
Fixed maturity securities, held-to-maturity, allowance for credit losses | $ 275,000 | $ 0
Fixed maturity securities, fair value | 631,688,000 | 621,343,000
Fixed maturity securities, available-for-sale, allowance for credit losses | 0 | 0
Fixed maturity securities, amortized cost | 401,671,000 | 425,698,000
Equity securities, cost | 33,227,000 | 24,457,000
Amounts recoverable from reinsurers, allowance for credit losses | 449,000 | 0
Premiums receivable, allowance for credit losses | $ 5,050,000 | $ 5,112,000
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 50,000,000 | 50,000,000
Common stock, shares issued | 20,561,034 | 20,560,833
Common stock, shares outstanding | 19,302,784 | 19,302,583
Treasury stock, shares | 1,258,250 | 1,258,250

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