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General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses - Components of General and Administrative Expenses and Other Expenses (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 15, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |
Fixed compensation expense |  | $ 11,285 | $ 10,103 | $ 34,359 | $ 36,605
Annual variable compensation |  | 19,844 | 5,882 | 51,021 | 9,171
Long-term incentive award expense |  | 4,915 | 2,639 | 14,766 | 7,896
Acquisition-related equity compensation expense |  | 1,189 | 1,212 | 3,613 | 3,636
Systems and consulting |  | 2,975 | 2,145 | 9,224 | 7,752
Office costs |  | 2,197 | 1,859 | 6,029 | 5,854
Accounting and legal |  | 1,197 | 1,601 | 3,132 | 6,605
Corporate costs |  | 964 | 831 | 2,528 | 2,128
Other |  | 3,126 | 1,358 | 7,165 | 5,185
Total General and Administrative Expenses |  | 47,692 | 27,630 | 131,837 | 84,832
Commissions |  | 1,906 | 879 | 4,830 | 3,027
Underwriting costs |  | 2,351 | 771 | 5,872 | 3,289
Transfer and holding costs |  | 364 | 508 | 1,226 | 1,400
Total Loan Acquisition Costs |  | 4,621 | 2,158 | 11,928 | 7,716
Goodwill impairment expense |  | 0 | 0 | 0 | 88,675
Amortization of purchase-related intangible assets |  | 3,873 | 3,873 | 11,619 | 12,052
Other |  | 150 | 3,915 | 485 | 3,559
Total Other Expenses |  | 4,023 | 7,788 | 12,104 | 104,286
Total General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses |  | 56,336 | $ 37,576 | 155,869 | $ 196,834
Settlement in Common Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Long-term incentive award expense |  | 3,000 |  | 10,000 |
Settlement in Cash |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Long-term incentive award expense |  | $ 1,000 |  | $ 4,000 |
CoreVest |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Restricted stock awards (in shares) | 588,260 |  |  |  |
Restricted stock awards | $ 10,000 |  |  |  |
Contingent consideration performance term | 2 years |  |  |  |

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