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
 9 Months Ended 12 Months Ended
Dec. 31, 2023
Mar. 31, 2023
Revenue, Major Customer [Line Items]    
Total non-interest-bearing accounts $ 1,065,203 $ 1,092,496
Total customer liabilities 2,248,042 1,925,247
Current customer accounts    
Revenue, Major Customer [Line Items]    
Total non-interest-bearing accounts 372,029 458,954
Brokerage customers    
Revenue, Major Customer [Line Items]    
Total non-interest-bearing accounts 693,174 633,542
Term deposits    
Revenue, Major Customer [Line Items]    
Term deposits $ 1,182,839 $ 832,751
Term deposits | Minimum    
Revenue, Major Customer [Line Items]    
Debt securities, interest rate during period (in percent) 0.05% 0.10%
Term deposits | Maximum    
Revenue, Major Customer [Line Items]    
Debt securities, interest rate during period (in percent) 16.90% 16.90%