Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Available-for-sale, amortized cost	$ 1,771,041	$ 1,662,680
Available-for-sale securities, allowance for credit losses	1	3
Equity securities, cost	29,238	75,292
Allowance for doubtful accounts	1,794	1,575
Property and equipment, accumulated depreciation	68,242	59,566
Reinsurance receivables, allowance for credit losses	$ 97	$ 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)	25,269,842	25,210,541
Common stock, shares outstanding (in shares)	25,269,842	25,210,541