Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reinsurance Retention Policy
Amount of risk reinsured in excess of stated retention	$ 3,300,000
Flood premiums ceded (percentage)			100.00%
Insurance commissions and fees under Flood Program	$ 431	$ 394	$ 1,195	$ 1,034
Document Period End Date			Sep. 30, 2020