Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Reinsurance Retention Policy
Prepaid reinsurance premiums	$ 460,147		$ 460,147		$ 217,885
Flood premiums ceded (percentage)			100.00%
Insurance commissions and fees under Flood Program	$ 298	$ 399	$ 640	$ 787