Reinsurance - Excess of Loss Reinsurance (Details) - USD ($) $ in Thousands			1 Months Ended	12 Months Ended
	May 01, 2019	Oct. 01, 2018	Oct. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Home Re 2020-1
Effects of Reinsurance [Line Items]
Remaining First Layer Retention			$ 275,283	$ 275,283	$ 0	$ 0
Remaining Excess of Loss Reinsurance Coverage			$ 412,917	412,917	0	0
Home Re 2019-1
Effects of Reinsurance [Line Items]
Remaining First Layer Retention	$ 185,730			184,514	185,636	0
Remaining Excess of Loss Reinsurance Coverage	$ 315,739			208,146	271,021	0
Home Re 2018-1
Effects of Reinsurance [Line Items]
Remaining First Layer Retention		$ 168,691		166,005	167,779	168,691
Remaining Excess of Loss Reinsurance Coverage		$ 318,636		$ 218,343	$ 260,957	$ 318,636