Securitization Transactions Schedule of Residential Loan Securitizations (Details) - Non-QM loan securitization [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
November 15, 2017 [Member]
Securitization Transactions [Line Items]
Economic interest retained	5.10%
Purchase of certificates	$ 700
Notes issued by non-QM securitization trust	$ 141,233	[1]
November 13, 2018 [Member]
Securitization Transactions [Line Items]
Economic interest retained	5.70%
Purchase of certificates	$ 1,300
Notes issued by non-QM securitization trust	232,518	[2]
The Company [Member] | November 15, 2017 [Member]
Securitization Transactions [Line Items]
Non-QM loans transferred into securitization trust	141,233
The Company [Member] | November 13, 2018 [Member]
Securitization Transactions [Line Items]
Non-QM loans transferred into securitization trust	$ 232,518

[1] In order to comply with the Risk Retention Rules, the Sponsor purchased the two most subordinated classes of Certificates and the excess cash flow certificates, with an aggregate value equal to 5.1% of the fair value of all Certificates issued. The Sponsor also purchased, for an aggregate purchase price of $0.7 million, the Certificates entitled to excess servicing fees, while the remaining classes of Certificates were purchased by unrelated third parties.

[2] In order to comply with the Risk Retention Rules, the Sponsor purchased the two most subordinated classes of Certificates and the excess cash flow certificates, with an aggregate value equal to 5.7% of the fair value of all Certificates issued. The Sponsor also purchased, for an aggregate purchase price of $1.3 million, the Certificates entitled to excess servicing fees, while the remaining classes of Certificates were purchased by unrelated third parties.