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v3.25.2

INVESTMENT SECURITIES - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) issuer | Sep. 30, 2024 | Mar. 31, 2025 USD ($) issuer
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of issuers | issuer | 2 |  | 2
Investment securities | $ 2,796,881 |  | $ 2,814,733
Accumulated impairment loss | 360 |  | 406
Fair value of held-to-maturity | 307,815 |  | 64,952
Non-US sovereign debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated impairment loss | 360 |  | 378
Fair value of held-to-maturity | 307,815 |  | 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 | 199,580 |  | 45,216
Significant Other Observable Inputs | Non-US sovereign debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of held-to-maturity | $ 108,235 |  | 19,736
Kazakhstan Sustainability Fund JSC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of trading securities | 10.00% | 10.00% |
Investment securities | $ 477,026 |  | 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 | $ 1,545,644 |  | $ 1,527,340

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