Reinsurance - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Reinsurance Disclosures [Abstract]
Maximum amount beyond which net loss on any individual risk is limited through the purchase of reinsurance	$ 9,700,000
Percentage of reinsurance recoverables due from companies with financial strength ratings of "A" or better by A.M. Best and S&P rating services	89.00%
Amount of allowance for uncollectible amounts on paid recoverables	$ 16,100,000	$ 15,900,000
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts	11,188,000	$ 8,634,000
Financing receivable, allowance for credit loss, write-off	0
Financing receivable, allowance for credit loss, recovery	200,000
Amount of allowance for uncollectible amounts due beyond one year	$ 0
Threshold period for including reinsurance receivables in the allowance for uncollectible amounts	1 year