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INVESTMENT SECURITIES - Held to Maturity, Amortized cost to fair value (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total held-to-maturity securities | $ 331,092 | $ 65,860
Gross unrecognized holding gains | 88 | 332
Gross unrecognized holding losses | (19,965) | (1,240)
Fair value of held-to-maturity | 311,215 | 64,952
Non-US sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total held-to-maturity securities | 331,092 | 65,860
Gross unrecognized holding gains | 88 | 332
Gross unrecognized holding losses | (19,965) | (1,240)
Fair value of held-to-maturity | $ 311,215 | $ 64,952

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