Quarterly report [Sections 13 or 15(d)]

INVESTMENT SECURITIES - Narrative (Details)

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