COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Other Commitments [Line Items] | ||||||
| Loans originated or purchased, borrowers permitted to draw amounts after original origination date, period | 5 years | 5 years | ||||
| Commitment to lend | $ 41,200 | $ 41,200 | $ 29,100 | $ 37,700 | ||
| Gains (losses) on loans repurchase obligations | 1,400 | $ (1,800) | (2,300) | $ (6,000) | 8,200 | 10,100 |
| Lease rent expense | 700 | 700 | 1,900 | 2,000 | 2,800 | $ 2,900 |
| ROU assets | 5,500 | 5,500 | 2,500 | |||
| Lease liabilities | $ 5,822 | $ 5,822 | $ 2,790 | |||
| Weighted average remaining lease term | 4 years 3 months 18 days | 4 years 3 months 18 days | 1 year 2 months 12 days | 2 years 1 month 6 days | ||
| Weighted average discount rate, percent | 9.00% | 9.00% | 2.00% | 1.90% | ||
| Lease payments | $ 700 | $ 700 | $ 2,000 | $ 2,000 | $ 3,000 | $ 2,900 |
| Obligation to Repurchase Receivables Sold | ||||||
| Other Commitments [Line Items] | ||||||
| Contractual obligation | 14,600 | 14,600 | 13,800 | |||
| Unpaid principal balance | 1,500,000 | 1,500,000 | 698,100 | |||
| Loss contingency accrual | 6,400 | 6,400 | 6,000 | |||
| Loan Purchase and Servicing Commitments | ||||||
| Other Commitments [Line Items] | ||||||
| Contractual obligation | $ 13,400 | $ 13,400 | $ 142,200 | $ 25,600 | ||