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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, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Fixed compensation expense |  | $ 10,103 |  | $ 9,391 | $ 36,605 | $ 26,740
Variable compensation expense |  | 5,882 |  | 3,489 | 9,171 | 11,356
Equity compensation expense |  | 2,639 |  | 3,155 | 7,896 | 10,132
Acquisition-related equity compensation expense |  | 1,212 |  | 0 | 3,636 | 0
Systems and consulting |  | 2,145 |  | 3,230 | 7,752 | 7,594
Office costs |  | 1,859 |  | 1,517 | 5,854 | 4,406
Accounting and legal |  | 1,601 |  | 1,767 | 6,605 | 3,852
Corporate costs |  | 831 |  | 482 | 2,128 | 1,701
Other operating expenses |  | 1,358 |  | 1,868 | 5,185 | 4,941
Total General and Administrative Expenses |  | 27,630 |  | 24,899 | 84,832 | 70,722
Commissions |  | 879 |  | 659 | 3,027 | 1,432
Underwriting costs |  | 771 |  | 1,074 | 3,289 | 3,184
Transfer and holding costs |  | 508 |  | 183 | 1,400 | 891
Total Loan Acquisition Costs |  | 2,158 |  | 1,916 | 7,716 | 5,507
Goodwill impairment expense |  | 0 | $ 89,000 | 0 | 88,675 | 0
Amortization of purchase-related intangible assets |  | 3,873 |  | 1,897 | 12,052 | 4,608
Contingent consideration expense |  | 135 |  | 236 | 581 | 547
Other |  | 3,780 |  | 398 | 2,978 | 866
Total Other Expenses |  | 7,788 |  | 2,531 | 104,286 | 6,021
Total General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses |  | 37,576 |  | $ 29,346 | 196,834 | $ 82,250
Variable compensation expense |  | 3,000 |  |  | 3,000 |
Cash Based Retention Award |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash-based retention awards granted |  | $ 8,000 |  |  | $ 8,000 |
Variable compensation expense, term |  | 3 years |  |  |  |
Long Term Relative TSR Performance Vesting Cash Awards |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Variable compensation expense, service period |  | 3 years |  |  |  |
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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