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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Statement Of Financial Position [Abstract] |  |
Fixed maturity securities, held-to-maturity, allowance for credit losses | $ 290 | $ 195
Fixed maturity securities, fair value | 545,425 | 575,850
Fixed maturity securities, available-for-sale, allowance for credit losses | 0 | 0
Fixed maturity securities, amortized cost | 342,784 | 324,597
Equity securities, cost | 48,151 | 44,175
Amounts recoverable from reinsurers, allowance for credit losses | 388 | 440
Premiums receivable, allowance for credit losses | $ 4,530 | $ 4,386
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 50,000,000 | 50,000,000
Common stock, shares issued | 20,622,565 | 20,622,304
Common stock, shares outstanding | 19,320,422 | 19,364,054
Treasury stock, shares | 1,302,143 | 1,258,250

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