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Basis of Presentation - Intangible Assets – Activity (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets at Acquisition | $ 52,992 |  |
Carrying value | 52,992 |  |
5 Arches LLC and CoreVest |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets at Acquisition | 52,992 | $ 56,865 | $ 81,300
Accumulated amortization | (28,308) | (24,435) |
Carrying value | $ 52,992 | 56,865 | 81,300
Weighted Average Amortization Period (in years) | 6 years |  |
5 Arches LLC and CoreVest | Borrower Network [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets at Acquisition | $ 35,863 | 37,481 | 45,300
Accumulated amortization | (9,437) | (7,819) |
Carrying value | $ 35,863 | 37,481 | 45,300
Weighted Average Amortization Period (in years) | 7 years |  |
5 Arches LLC and CoreVest | Broker Network [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets at Acquisition | $ 10,558 | 11,463 | 18,100
Accumulated amortization | (7,542) | (6,637) |
Carrying value | $ 10,558 | 11,463 | 18,100
Weighted Average Amortization Period (in years) | 5 years |  |
5 Arches LLC and CoreVest | Noncompete Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets at Acquisition | $ 4,278 | 5,069 | 9,500
Accumulated amortization | (5,222) | (4,431) |
Carrying value | $ 4,278 | 5,069 | 9,500
Weighted Average Amortization Period (in years) | 3 years |  |
5 Arches LLC and CoreVest | Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets at Acquisition | $ 1,806 | 2,140 | 4,000
Accumulated amortization | (2,194) | (1,860) |
Carrying value | $ 1,806 | 2,140 | 4,000
Weighted Average Amortization Period (in years) | 3 years |  |
5 Arches LLC and CoreVest | Developed Technology Rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets at Acquisition | $ 487 | 712 | 1,800
Accumulated amortization | (1,313) | (1,088) |
Carrying value | $ 487 | 712 | 1,800
Weighted Average Amortization Period (in years) | 2 years |  |
5 Arches LLC and CoreVest | Management Fee On Existing Assets Under Management [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets at Acquisition | $ 0 | 0 | 2,600
Accumulated amortization | (2,600) | (2,600) |
Carrying value | $ 0 | $ 0 | $ 2,600
Weighted Average Amortization Period (in years) | 1 year |  |

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