Insurance Company WNFIC - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Reinsurer	Dec. 31, 2020 USD ($)	Sep. 30, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program	100.00%
Premiums written net	$ 747,366	$ 728,093
Ceded unpaid loss	63,100	43,500
Prepaid reinsurance premiums	392,222	377,615
Increase (decrease) in loss and loss adjustment expense reserve	0	0
Reserve for losses and loss adjustment expense	$ 63,100	43,500
Number of reinsurers | Reinsurer	2
Wright National Flood Insurance Company
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program	100.00%
Expenses and allowance rate received in premiums	29.90%		30.00%
Premiums written net	$ 745,000	725,800
Statutory capital and surplus required	7,500
Statutory capital and surplus	33,100	32,600
Statutory net Income	$ 1,600	$ 800
Percentage of adjusted net income	100.00%
Maximum dividend payout that may be made without prior approval	$ 3,300
Wright National Flood Insurance Company | Maximum
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Preferred stock, dividend rate, percentage	10.00%