Basis of Presentation - Intangible Assets – Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2019	$ 72,789
Additions	0
Amortization Expense	(4,306)
Carrying Value at March 31, 2020	$ 68,483
Weighted Average Amortization Period (in years)	6 years
5 Arches LLC and CoreVest | Borrower network
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2019	$ 43,952
Additions	0
Amortization Expense	(1,618)
Carrying Value at March 31, 2020	$ 42,334
Weighted Average Amortization Period (in years)	7 years
5 Arches LLC and CoreVest | Broker network
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2019	$ 15,083
Additions	0
Amortization Expense	(905)
Carrying Value at March 31, 2020	$ 14,178
Weighted Average Amortization Period (in years)	4 years
5 Arches LLC and CoreVest | Non-compete agreements
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2019	$ 8,236
Additions	0
Amortization Expense	(792)
Carrying Value at March 31, 2020	$ 7,444
Weighted Average Amortization Period (in years)	3 years
5 Arches LLC and CoreVest | Tradename
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2019	$ 3,472
Additions	0
Amortization Expense	(333)
Carrying Value at March 31, 2020	$ 3,139
Weighted Average Amortization Period (in years)	3 years
5 Arches LLC and CoreVest | Developed technology
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2019	$ 1,613
Additions	0
Amortization Expense	(225)
Carrying Value at March 31, 2020	$ 1,388
Weighted Average Amortization Period (in years)	2 years
5 Arches LLC and CoreVest | Loan administration fees on existing loan assets
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2019	$ 433
Additions	0
Amortization Expense	(433)
Carrying Value at March 31, 2020	$ 0