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Reserve Requirements	12 Months Ended
Reserve Requirements	Dec. 31, 2019
Reserve Requirements Disclosure [Abstract]
Reserve Requirements	27. RESERVE REQUIREMENTS As of December 31, 2019, and 2018, JVB was not subject to the reserve requirements under Rule 15c3-3 of the Securities Exchange Act of 1934 because JVB does not carry securities accounts for their customers or perform custodial functions relating to customer securities and, therefore, they qualify for an exemption under Rule 15c3-3(k)(2)(ii).