Quarterly report [Sections 13 or 15(d)]

INVESTMENT SECURITIES - Schedule of reconciliation of the beginning and ending balance for investments that use Level 3 inputs (Details)

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INVESTMENT SECURITIES - Schedule of reconciliation of the beginning and ending balance for investments that use Level 3 inputs (Details) - Investments - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Investments beginning $ 18,320 $ 20,442
Reclassification to Level 3 1,073  
Sale of investments that use Level 3 inputs 0  
Purchase of investments that use Level 3 inputs 1,974  
Revaluation of investments that use Level 3 inputs 1,087 (2,122)
Investments ending $ 22,454 $ 18,320