Quarterly report [Sections 13 or 15(d)]

INVESTMENT SECURITIES - Schedule of present securities assets at fair value (Details)

v3.25.2
INVESTMENT SECURITIES - Schedule of present securities assets at fair value (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Mar. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 2,001,392 $ 2,275,286
Total available-for-sale securities, at fair value 492,138 473,587
Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 2,001,392 2,275,286
Total available-for-sale securities, at fair value 492,138 473,587
Quoted Prices in Active Markets for Identical Assets | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 1,109,878 1,444,746
Total available-for-sale securities, at fair value 217,349 241,935
Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 870,942 812,220
Total available-for-sale securities, at fair value 274,789 231,652
Significant Unobservable Units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 20,572 18,320
Total available-for-sale securities, at fair value 0 0
Non-U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 1,042,485 1,282,450
Total available-for-sale securities, at fair value $ 230,572 $ 208,231
Non-U.S. sovereign debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 11.06% 11.24%
Total trading securities $ 1,042,485 $ 1,282,450
Total available-for-sale securities, weighted average interest rate 11.53% 9.96%
Total available-for-sale securities, at fair value $ 230,572 $ 208,231
Non-U.S. sovereign debt | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 632,872 987,657
Total available-for-sale securities, at fair value 126,118 128,772
Non-U.S. sovereign debt | Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 409,613 294,793
Total available-for-sale securities, at fair value 104,454 79,459
Non-U.S. sovereign debt | Significant Unobservable Units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 0 0
Total available-for-sale securities, at fair value 0 0
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 751,558 807,985
Total available-for-sale securities, at fair value $ 239,720 $ 243,730
Corporate debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 12.90% 13.93%
Total trading securities $ 751,558 $ 807,985
Total available-for-sale securities, weighted average interest rate 15.68% 14.81%
Total available-for-sale securities, at fair value $ 239,720 $ 243,730
Corporate debt | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 294,247 299,123
Total available-for-sale securities, at fair value 69,385 91,537
Corporate debt | Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 456,270 508,862
Total available-for-sale securities, at fair value 170,335 152,193
Corporate debt | Significant Unobservable Units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 1,041 0
Total available-for-sale securities, at fair value 0 0
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 128,316 $ 106,227
Corporate equity | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 0.00% 0.00%
Total trading securities $ 128,316 $ 106,227
Corporate equity | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 106,238 81,810
Corporate equity | Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 2,547 6,097
Corporate equity | Significant Unobservable Units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 19,531 18,320
U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 74,369 73,787
Total available-for-sale securities, at fair value $ 21,846 $ 21,626
U.S. sovereign debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 3.88% 3.99%
Total trading securities $ 74,369 $ 73,787
Total available-for-sale securities, weighted average interest rate 3.99% 2.73%
Total available-for-sale securities, at fair value $ 21,846 $ 21,626
U.S. sovereign debt | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 74,369 73,787
Total available-for-sale securities, at fair value 21,846 21,626
U.S. sovereign debt | Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 0 0
Total available-for-sale securities, at fair value 0 0
U.S. sovereign debt | Significant Unobservable Units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 0 0
Total available-for-sale securities, at fair value 0 0
Exchange traded notes and funds    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 4,664 $ 4,837
Exchange traded notes and funds | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 0.00% 0.00%
Total trading securities $ 4,664 $ 4,837
Exchange traded notes and funds | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 2,152 2,369
Exchange traded notes and funds | Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 2,512 2,468
Exchange traded notes and funds | Significant Unobservable Units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 0 $ 0