Segment information - Reported Revenue and Profit Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue
Total	$ 294,111	$ 315,342	$ 797,361	$ 1,028,917
Pre-Tax Income (Loss)
Total pre-tax income (loss)	7,238	37,394	15,282	132,689
Private Client Division
Revenue
Total	178,614	160,864	473,932	491,750
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ 29,973	37,426	92,919	83,362
Asset management fees (as a percent)	90.00%
Asset Management
Revenue
Total	$ 24,870	26,894	76,302	76,668
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ 8,322	9,412	25,916	25,603
Asset management fees (as a percent)	10.00%
Capital markets
Revenue
Total	$ 90,947	128,585	247,272	460,129
Pre-Tax Income (Loss)
Total pre-tax income (loss)	2,401	17,888	(14,368)	107,252
Corporate/Other
Revenue
Total	(320)	(1,001)	(145)	370
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ (33,458)	$ (27,332)	$ (89,185)	$ (83,528)