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NET INTEREST INCOME/EXPENSE (Tables) | 3 Months Ended
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Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Interest Income and Interest Expense Disclosure |
| Three months ended June 30, 2025 |  | Three months ended June 30, 2024
Interest income: |  |  |
Interest income on loans to customers | $ | 61,694 |  |  | $ | 52,367 |
Interest income on margin loans to customers | 60,289 |  |  | 51,067 |
Interest income on trading securities | 52,576 |  |  | 107,128 |
Interest income on securities available-for-sale | 13,383 |  |  | 8,400 |
Interest income on reverse repurchase agreements and amounts due from banks | 5,456 |  |  | 7,042 |
Interest income on held-to-maturity securities | 5,173 |  |  | — |
Total interest income | $ | 198,571 |  |  | $ | 226,004 |
Interest expense: |  |  |
Interest expense on securities repurchase agreement obligations | $ | 45,461 |  |  | $ | 92,407 |
Interest expense on customer accounts and deposits | 39,332 |  |  | 23,127 |
Interest expense on debt securities issued | 13,751 |  |  | 6,969 |
Interest expense on margin lending payable | 13,374 |  |  | 23,123 |
Interest expense on loans received | 510 |  |  | 44 |
Other interest expense | 982 |  |  | 48 |
Total interest expense | $ | 113,410 |  |  | $ | 145,718 |
Net interest income | $ | 85,161 |  |  | $ | 80,286 |

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