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General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses - Components of Operating Expenses (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 15, 2019 | Dec. 31, 2020 | Oct. 31, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Fixed compensation expense |  |  |  |  |  |  | $ 46,689 | $ 39,639 | $ 24,445
Variable compensation expense |  |  |  |  |  |  | 14,116 | 21,728 | 14,589
Long-term incentive award expense |  |  |  |  |  |  | 12,439 | 13,402 | 12,388
Acquisition-related equity compensation expense |  |  |  |  |  |  | 4,848 | 1,010 | 0
Systems and consulting |  |  |  |  |  |  | 11,728 | 10,746 | 7,451
Office costs |  |  |  |  |  |  | 7,794 | 6,310 | 4,705
Accounting and legal |  |  |  |  |  |  | 7,928 | 5,450 | 5,529
Corporate costs |  |  |  |  |  |  | 2,829 | 2,351 | 1,955
Other |  |  |  |  |  |  | 6,833 | 8,101 | 4,236
Total General and Administrative Expenses |  |  |  |  |  |  | 115,204 | 108,737 | 75,298
Commissions |  |  |  |  |  |  | 4,321 | 3,833 | 78
Underwriting costs |  |  |  |  |  |  | 4,945 | 4,767 | 5,140
Transfer and holding costs |  |  |  |  |  |  | 1,757 | 1,335 | 2,266
Loan acquisition costs |  |  |  |  |  |  | 11,023 | 9,935 | 7,484
Goodwill impairment expense |  |  |  |  |  | $ 89,000 | 88,675 | 0 | 0
Amortization of purchase-related intangible assets |  |  |  |  |  |  | 15,925 | 8,696 | 177
Contingent consideration expense |  |  |  |  |  |  | 200 | 3,218 | 0
Other |  |  |  |  |  |  | 3,936 | 1,108 | 19
Total Other Expenses |  |  |  |  |  |  | 108,785 | 13,022 | 196
Total General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses |  |  |  |  |  |  | 235,012 | $ 131,694 | $ 82,978
Variable compensation expense |  |  |  |  |  |  | 5,000 |  |
Settlement in Common Stock |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Long-term incentive award expense |  |  |  |  |  |  | 10,000 |  |
Settlement in Cash |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Long-term incentive award expense |  |  |  |  |  |  | 2,000 |  |
Cash Based Retention Award |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Cash based retention awards granted |  |  |  |  | $ 8,000 |  |  |  |
Cash based retention awards, term |  |  |  | 3 years | 3 years |  |  |  |
Cash Based Retention Award | Certain Executives and Non-Executive Employees |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Cash based retention awards granted |  |  |  |  | $ 2,000 |  |  |  |
Long Term Relative TSR Performance Vesting Cash Awards |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Cash based retention awards, service period |  |  |  |  | 3 years |  |  |  |
Cash-Settled Deferred Stock Units |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Cash based retention awards granted |  | $ 2,000 |  | $ 2,000 |  |  | $ 2,000 |  |
Cash based retention awards, term |  | 4 years |  |  |  |  |  |  |
Variable compensation expense |  | $ 2,000 |  |  |  |  |  |  |
CoreVest LLC |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Acquisition-related equity compensation expense |  |  | $ 10,000 |  |  |  |  |  |
Restricted stock awards (in shares) | 588,260 |  |  |  |  |  |  |  |
Restricted stock awards | $ 10,000 |  | $ 10,000 |  |  |  |  |  |
Contingent consideration performance term | 2 years |  |  |  |  |  |  |  |

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