RESTRUCTURING CHARGE - Schedule of summarize the restructuring activities by reportable segment (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Employee termination							$ 2,204
Impairment of intangibles							4,174		$ 1,557
Facility closure and consolidation							2,633
Total restructuring charge	$ 995	$ 8,016	$ 0	$ 0	$ 0	$ 8,016	9,011	$ 0	1,557
Capital Markets Segment
Segment Reporting Information [Line Items]
Employee termination							0
Impairment of intangibles							0		917
Facility closure and consolidation							0
Total restructuring charge							0		917
Wealth Management Segment
Segment Reporting Information [Line Items]
Employee termination							1,150
Impairment of intangibles							2,012		0
Facility closure and consolidation							1,792
Total restructuring charge							4,954		0
Auction and Liquidation segment:
Segment Reporting Information [Line Items]
Employee termination							0
Impairment of intangibles							0		140
Facility closure and consolidation							0
Total restructuring charge							0		140
Financial Consulting Segment
Segment Reporting Information [Line Items]
Employee termination							0
Impairment of intangibles							0		500
Facility closure and consolidation							0
Total restructuring charge							0		500
Communications Segment
Segment Reporting Information [Line Items]
Employee termination							1,054
Impairment of intangibles							2,162		0
Facility closure and consolidation							841
Total restructuring charge							$ 4,057		$ 0