Insurance Company WNFIC - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) Reinsurer	Dec. 31, 2020 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceded rate of premiums under insurance program	100.00%
Premiums written net	$ 145,477
Ceded unpaid loss	26,300
Prepaid reinsurance premiums	345,031	$ 377,615
Increase (decrease) in loss and loss adjustment expense reserve	0
Reserve for losses and loss adjustment expense	$ 26,300
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	30.00%
Premiums written net	$ 145,000
Ceded to highly rated carriers for excess flood policies	500
Statutory capital and surplus required	7,500
Statutory capital and surplus	33,000	32,600
Statutory net Income	$ 0	$ 800
Preferred stock, dividend rate, percentage	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%