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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 | 6 Months Ended
--- | --- | --- | ---
Oct. 15, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |
Fixed compensation expense |  | $ 11,269 | $ 11,818 | $ 23,074 | $ 26,502
Annual variable compensation |  | 12,508 | 3,278 | 31,177 | 3,289
Long-term incentive award expense |  | 5,682 | 3,262 | 9,851 | 5,257
Acquisition-related equity compensation expense |  | 1,212 | 1,212 | 2,424 | 2,424
Systems and consulting |  | 3,272 | 2,395 | 6,249 | 5,607
Office costs |  | 2,024 | 1,887 | 3,832 | 3,995
Accounting and legal |  | 1,221 | 2,788 | 1,935 | 5,004
Corporate costs |  | 873 | 626 | 1,564 | 1,297
Other |  | 2,533 | 1,254 | 4,039 | 3,827
Total General and Administrative Expenses |  | 40,594 | 28,520 | 84,145 | 57,202
Commissions |  | 1,661 | 360 | 2,924 | 2,148
Underwriting costs |  | 1,836 | 856 | 3,521 | 2,518
Transfer and holding costs |  | 251 | 356 | 862 | 892
Total Loan Acquisition Costs |  | 3,748 | 1,572 | 7,307 | 5,558
Goodwill impairment expense |  | 0 | 0 | 0 | 88,675
Amortization of purchase-related intangible assets |  | 3,873 | 3,873 | 7,746 | 8,182
Other |  | 112 | 1,210 | 335 | (359)
Total Other Expenses |  | 3,985 | 5,083 | 8,081 | 96,498
Total General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses |  | 48,327 | $ 35,175 | 99,533 | $ 159,258
Settlement in Common Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Long-term incentive award expense |  | 4,000 |  | 7,000 |
Settlement in Cash |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Long-term incentive award expense |  | $ 1,000 |  | $ 3,000 |
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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