Quarterly report pursuant to Section 13 or 15(d)

TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Narrative (Details)

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TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Narrative (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
issuer
Mar. 31, 2021
USD ($)
issuer
Defined Benefit Plan Disclosure [Line Items]    
Number of issuers | issuer 2 2
Trading securities $ 1,348,656 $ 736,188
Corporate equity    
Defined Benefit Plan Disclosure [Line Items]    
Trading securities $ 161,550 $ 47,340
Kazakhstan Sustainability Fund JSC    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of trading securities 10.00% 10.00%
Debt securities $ 297,214 $ 193,677
Ministry of Finance of the Republic of Kazakhstan    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of trading securities 10.00% 10.00%
Debt securities $ 374,982 $ 293,451
Public Joint Stock Company, St. Petersburg Exchange | Corporate equity    
Defined Benefit Plan Disclosure [Line Items]    
Trading securities $ 140,257