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v3.25.3

INVESTMENT SECURITIES - Narrative (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) issuer
Defined Benefit Plan Disclosure [Line Items] |  |
Investment securities | $ 2,511,419 | $ 2,814,733
Number of issuers | issuer |  | 2
Accumulated impairment loss | 388 | $ 406
Fair value of held-to-maturity | 311,215 | 64,952
Non-US sovereign debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated impairment loss | 388 | 378
Fair value of held-to-maturity | 311,215 | 64,952
Quoted Prices in Active Markets for Identical Assets | Non-US sovereign debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of held-to-maturity | 70,876 | 45,216
Significant Other Observable Inputs | Non-US sovereign debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of held-to-maturity | $ 240,339 | $ 19,736
Kazakhstan Sustainability Fund JSC |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of trading securities | 10.00% | 10.00%
Investment securities |  | $ 578,862
Ministry of Finance of the Republic of Kazakhstan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of trading securities | 10.00% | 10.00%
Investment securities | $ 1,492,464 | $ 1,527,340

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