Segment information - Reported Revenue and Profit Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue
Total revenue	$ 1,110,941	$ 1,394,035	$ 1,198,667
Pre-Tax Income (Loss)
Total pre-tax income (loss)	45,554	224,641	169,000
Private Client
Revenue
Total revenue	675,680	665,060	642,083
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ 142,250	$ 101,146	$ 122,844
Asset management fees	90.00%	90.00%	90.00%
Asset Management
Revenue
Total revenue	$ 99,242	$ 104,598	$ 130,274
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ 35,753	$ 35,874	$ 71,625
Asset management fees	10.00%	10.00%	10.00%
Capital markets
Revenue
Total revenue	$ 337,821	$ 625,704	$ 426,752
Pre-Tax Income (Loss)
Total pre-tax income (loss)	(25,696)	204,090	83,442
Corporate/Other
Revenue
Total revenue	(1,802)	(1,327)	(442)
Pre-Tax Income (Loss)
Total pre-tax income (loss)	$ (106,753)	$ (116,469)	$ (108,911)