Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Fixed maturities, at amortized cost	$ 437,036,000	$ 577,789,000
Equity securities, cost	1,599,000	1,618,000
Reinsurance recoverable net of allowance for estimated uncollectible reinsurance	$ 54,100	$ 54,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	28,058,873	28,996,452
Common stock, shares outstanding	27,748,606	28,650,918
Treasury stock, shares	9,279,839	8,349,483