Quarterly report pursuant to Section 13 or 15(d)

BROKERAGE AND OTHER RECEIVABLES NET - Narrative (Details)

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BROKERAGE AND OTHER RECEIVABLES NET - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Margin lending receivables $ 125,799 $ 9,866
Other Receivables (194,158) (49,518)
Allowance for receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other Receivables $ (1,759) $ (1,981)
Margin lending, brokerage and other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Due from related party customer (in percent) 65.00% 20.00%
Margin lending, brokerage and other receivables | FFIN Brokerage Services, Inc.    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Due from related party customer (in percent) 59.00% 83.00%