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NET GAIN ON TRADING SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |  |
Net gain recognized during the period on trading securities sold during the period | $ 7,866 | $ 12,841
Net unrealized gain/(loss) recognized during the reporting period on trading securities still held at the reporting date | $ 37,736 | $ (64,943)

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