Quarterly report [Sections 13 or 15(d)]

INVESTMENT SECURITIES - Schedule of trading and available-for-sale securities (Details)

v3.25.3
INVESTMENT SECURITIES - Schedule of trading and available-for-sale securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Mar. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 1,740,526 $ 2,275,286
Total available-for-sale securities, at fair value 439,801 473,587
Total held-to-maturity securities 331,092 65,860
Total investment securities 2,511,419 2,814,733
Non-U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 977,357 1,282,450
Total available-for-sale securities, at fair value 220,214 208,231
Non-U.S. sovereign debt 331,263 65,914
Allowance for Non-US sovereign debt (171) (54)
Total held-to-maturity securities 331,092 65,860
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 532,203 807,985
Total available-for-sale securities, at fair value 197,676 243,730
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 148,271 106,227
U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 76,343 73,787
Total available-for-sale securities, at fair value 21,911 21,626
Exchange traded notes and funds    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 6,352 $ 4,837