Basis of Presentation - Intangible Assets – Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible Assets at Acquisition	$ 38,027
Carrying value	38,027
5 Arches LLC and CoreVest
Finite-Lived Intangible Assets [Line Items]
Intangible Assets at Acquisition	38,027	$ 81,300
Accumulated amortization	(43,273)
Carrying value	$ 38,027	81,300
Weighted Average Amortization Period (in years)	6 years
5 Arches LLC and CoreVest | Borrower network
Finite-Lived Intangible Assets [Line Items]
Intangible Assets at Acquisition	$ 29,391	45,300
Accumulated amortization	(15,909)
Carrying value	$ 29,391	45,300
Weighted Average Amortization Period (in years)	7 years
5 Arches LLC and CoreVest | Broker network
Finite-Lived Intangible Assets [Line Items]
Intangible Assets at Acquisition	$ 6,938	18,100
Accumulated amortization	(11,162)
Carrying value	$ 6,938	18,100
Weighted Average Amortization Period (in years)	5 years
5 Arches LLC and CoreVest | Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible Assets at Acquisition	$ 1,192	9,500
Accumulated amortization	(8,308)
Carrying value	$ 1,192	9,500
Weighted Average Amortization Period (in years)	3 years
5 Arches LLC and CoreVest | Tradenames
Finite-Lived Intangible Assets [Line Items]
Intangible Assets at Acquisition	$ 506	4,000
Accumulated amortization	(3,494)
Carrying value	$ 506	4,000
Weighted Average Amortization Period (in years)	3 years
5 Arches LLC and CoreVest | Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible Assets at Acquisition	$ 0	1,800
Accumulated amortization	(1,800)
Carrying value	$ 0	1,800
Weighted Average Amortization Period (in years)	2 years
5 Arches LLC and CoreVest | Loan administration fees on existing loan assets
Finite-Lived Intangible Assets [Line Items]
Intangible Assets at Acquisition	$ 0	2,600
Accumulated amortization	(2,600)
Carrying value	$ 0	$ 2,600
Weighted Average Amortization Period (in years)	1 year