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
Dec. 31, 2021
Mar. 31, 2021
Revenue, Major Customer [Line Items]    
Customer liabilities $ 1,145,070 $ 1,163,697
Brokerage customers    
Revenue, Major Customer [Line Items]    
Customer liabilities 879,598 938,086
Banking customers    
Revenue, Major Customer [Line Items]    
Customer liabilities $ 265,472 $ 225,611