Quarterly report pursuant to Section 13 or 15(d)

CUSTOMER LIABILITIES - Schedule of customer liabilities (Details)

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CUSTOMER LIABILITIES - Schedule of customer liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Sep. 30, 2024
Mar. 31, 2024
Revenue, Major Customer [Line Items]      
Total non-interest-bearing accounts   $ 1,965,641 $ 1,052,758
Customer liabilities   3,329,133 2,273,830
Term deposits      
Revenue, Major Customer [Line Items]      
Term deposits   $ 1,363,492 1,221,072
Term deposits | Minimum      
Revenue, Major Customer [Line Items]      
Debt securities, interest rate during period (in percent) 0.04% 0.05%  
Term deposits | Maximum      
Revenue, Major Customer [Line Items]      
Debt securities, interest rate during period (in percent) 17.30% 17.70%  
Brokerage customers      
Revenue, Major Customer [Line Items]      
Total non-interest-bearing accounts   $ 1,617,887 742,902
Current customer accounts      
Revenue, Major Customer [Line Items]      
Total non-interest-bearing accounts   $ 347,754 $ 309,856