Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Available-for-sale, amortized cost	$ 1,794,325	$ 1,662,680
Equity securities, cost	29,238	75,292
Allowance for doubtful accounts	1,768	1,575
Property and equipment accumulated depreciation	66,257	59,566
Reinsurance receivables and recoverables, allowance for credit losses	$ 130	$ 82
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	25,263,742	25,210,541
Common stock, shares outstanding (in shares)	25,263,742	25,210,541