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
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Revenue, Major Customer [Line Items]      
Total non-interest-bearing accounts $ 1,137,202   $ 1,092,496
Total customer liabilities 2,122,047   1,925,247
Term Deposits      
Revenue, Major Customer [Line Items]      
Term deposits $ 984,845   832,751
Term Deposits | Minimum      
Revenue, Major Customer [Line Items]      
Debt securities, interest rate during period (in percent) 0.30% 0.10%  
Term Deposits | Maximum      
Revenue, Major Customer [Line Items]      
Debt securities, interest rate during period (in percent) 12.00% 16.90%  
Current customer accounts      
Revenue, Major Customer [Line Items]      
Total non-interest-bearing accounts $ 485,007   458,954
Brokerage customers      
Revenue, Major Customer [Line Items]      
Total non-interest-bearing accounts $ 652,195   $ 633,542