Investments - Summary of Significant Credit Quality Indicators Measured at Amortized Cost (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis by Origination Year, 2020	$ 8,611
Amortized Cost Basis by Origination Year, 2019	90,601
Amortized Cost Basis by Origination Year, 2018	0
Amortized Cost Basis by Origination Year, 2017	0
Amortized Cost Basis by Origination Year, 2016	2,815
Total Amortized Costs Basis	102,027
LTV less than 60%
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis by Origination Year, 2020	0
Amortized Cost Basis by Origination Year, 2019	28,000
Amortized Cost Basis by Origination Year, 2018	0
Amortized Cost Basis by Origination Year, 2017	0
Amortized Cost Basis by Origination Year, 2016	832
Total Amortized Costs Basis	28,832
LTV between 60% and 70%
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis by Origination Year, 2020	0
Amortized Cost Basis by Origination Year, 2019	34,604
Amortized Cost Basis by Origination Year, 2018	0
Amortized Cost Basis by Origination Year, 2017	0
Amortized Cost Basis by Origination Year, 2016	1,100
Total Amortized Costs Basis	35,704
LTV greater than 70%
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized Cost Basis by Origination Year, 2020	8,611
Amortized Cost Basis by Origination Year, 2019	27,997
Amortized Cost Basis by Origination Year, 2018	0
Amortized Cost Basis by Origination Year, 2017	0
Amortized Cost Basis by Origination Year, 2016	883
Total Amortized Costs Basis	$ 37,491