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TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Narrative (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) issuer | Sep. 30, 2022 USD ($) | Dec. 31, 2022 | Mar. 31, 2023 USD ($) issuer
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of issuers | issuer | 2 |  |  | 2
Other-than-temporary impairment in accumulated other comprehensive loss | $ 0 | $ 0 |  |
Kazakhstan Sustainability Fund JSC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of trading securities | 10.00% |  | 10.00% |
Debt securities | $ 770,185,000 |  |  | $ 834,917,000
Ministry of Finance of the Republic of Kazakhstan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of trading securities | 10.00% |  | 10.00% |
Debt securities | $ 2,005,538,000 |  |  | $ 1,015,161,000

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 + Details
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