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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |  |
Fixed compensation expense |  | $ 12,110 | $ 11,269 | $ 26,738 | $ 23,074 |
Annual variable compensation expense |  | 1,811 | 12,508 | 5,168 | 31,177 |
Long-term incentive award expense |  | 5,532 | 5,682 | 11,192 | 9,851 |
Acquisition-related equity compensation expense |  | 0 | 1,212 | 0 | 2,424 |
Systems and consulting |  | 3,703 | 3,272 | 6,887 | 6,249 |
Office costs |  | 2,083 | 2,024 | 4,108 | 3,832 |
Accounting and legal |  | 1,576 | 1,221 | 3,251 | 1,935 |
Corporate costs |  | 1,000 | 873 | 1,864 | 1,564 |
Other |  | 4,151 | 2,533 | 7,612 | 4,039 |
Total General and Administrative Expenses |  | 31,966 | 40,594 | 66,820 | 84,145 |
Commissions |  | 2,116 | 1,661 | 4,730 | 2,924 |
Underwriting costs |  | 1,096 | 1,836 | 2,468 | 3,521 |
Transfer and holding costs |  | 268 | 251 | 747 | 862 |
Total Loan Acquisition Costs |  | 3,480 | 3,748 | 7,945 | 7,307 |
Amortization of purchase-related intangible assets |  | 3,306 | 3,873 | 6,840 | 7,746 |
Other |  | 162 | 112 | 713 | 335 |
Total Other Expenses |  | 3,468 | 3,985 | 7,553 | 8,081 |
Total General and Administrative Expenses, Loan Acquisition Costs, and Other Expenses |  | 38,914 | 48,327 | 82,318 | 99,533 |
Settlement in Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term incentive award expense |  | 5,000 | 4,000 | 10,000 | 7,000 |
Settlement in Cash |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term incentive award expense |  | 400 | $ 1,000 | $ 1,000 | $ 3,000 |
Variable compensation expense, service period |  |  |  | 4 years |  |
Unamortized compensation cost |  | 3,000 |  | $ 3,000 |  | $ 7,000
Cash Based Retention Award |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash-based retention awards granted |  | 2,000 |  | $ 2,000 |  |
Variable compensation expense, term |  |  |  | 3 years |  |
Unamortized compensation cost |  | $ 4,000 |  | $ 4,000 |  | $ 4,000
CAFL |  |  |  |  |  |
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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