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RESTRUCTURING CHARGE - Schedule of restructuring activities by segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]
Employee termination			$ 1,260
Impairment of intangibles			4,174
Restructuring charge	$ 8,016	$ 0	8,016	$ 0
Facility Closing
Restructuring Cost and Reserve [Line Items]
Facility and other restructuring costs			2,582
Wealth Management Segment
Restructuring Cost and Reserve [Line Items]
Employee termination			354
Impairment of intangibles			2,012
Restructuring charge			4,107
Wealth Management Segment \| Facility Closing
Restructuring Cost and Reserve [Line Items]
Facility and other restructuring costs			1,741
Principal Investments- Communications and Other Segment
Restructuring Cost and Reserve [Line Items]
Employee termination			906
Impairment of intangibles			2,162
Restructuring charge			3,909
Principal Investments- Communications and Other Segment \| Facility Closing
Restructuring Cost and Reserve [Line Items]
Facility and other restructuring costs			$ 841