CUSTOMER LIABILITIES (Details) - USD ($) $ in Thousands  | 
Jun. 30, 2021  | 
Mar. 31, 2021  | 
|---|---|---|
| Customer liabilities | $ 1,067,864 | $ 1,163,697 | 
| Brokerage customers | ||
| Customer liabilities | 845,705 | 938,086 | 
| Banking customers | ||
| Customer liabilities | $ 222,159 | $ 225,611 | 
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