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INVESTMENT SECURITIES - Schedule of Maturities of Debt Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
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Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost , due within one year | $ 155,578 | $ 166,799
Estimated Fair Value, due within one year | 155,945 | 167,328
Amortized Cost, Due within years two through five years | 28,463 | 28,502
Estimated Fair Value, Due within years two through five | 28,673 | 28,296
Amortized Cost | 184,041 | 195,301
Estimated Fair Value | $ 184,618 | $ 195,624

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