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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
--- | --- | ---
Oct. 15, 2019 | Mar. 31, 2021 | Mar. 31, 2020
Business Acquisition [Line Items] |  |  |
Fixed compensation expense |  | $ 11,805 | $ 14,684
Annual variable compensation |  | 18,669 | 11
Long-term incentive award expense |  | 4,169 | 1,995
Acquisition-related equity compensation expense |  | 1,212 | 1,212
Systems and consulting |  | 2,977 | 3,212
Office costs |  | 1,808 | 2,108
Accounting and legal |  | 714 | 2,216
Corporate costs |  | 691 | 671
Other |  | 1,506 | 2,573
Total General and Administrative Expenses |  | 43,551 | 28,682
Commissions |  | 1,263 | 1,788
Underwriting costs |  | 1,685 | 1,662
Transfer and holding costs |  | 611 | 536
Total Loan Acquisition Costs |  | 3,559 | 3,986
Goodwill impairment expense |  | 0 | 88,675
Amortization of purchase-related intangible assets |  | 3,873 | 4,309
Other |  | 223 | (1,569)
Total Other Expenses |  | 4,096 | 91,415
Total General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses |  | 51,206 | $ 124,083
Settlement in Common Stock |  |  |
Business Acquisition [Line Items] |  |  |
Long-term incentive award expense |  | 3,000 |
Settlement in Cash |  |  |
Business Acquisition [Line Items] |  |  |
Long-term incentive award expense |  | $ 1,000 |
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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