Segment information - Schedule of Reported Revenue and Pre-Tax Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue
Revenue	$ 424,438	$ 373,352	$ 1,165,441	$ 1,057,079
Less :
Compensation expenses	290,222	237,935	756,387	680,377
Other Segment Items	102,581	100,047	303,833	288,012
Pre-tax income (loss)	31,635	35,370	105,221	88,690
Corporate/Other
Revenue
Revenue	2,567	3,273	8,921	10,289
Less :
Compensation expenses	34,999	25,016	81,271	73,469
Other Segment Items	10,750	8,758	18,983	25,540
Pre-tax income (loss)	(43,182)	(30,501)	(91,333)	(88,720)
Wealth Management | Operating Segments
Revenue
Revenue	259,726	246,049	748,133	718,536
Less :
Compensation expenses	148,978	125,270	400,917	364,381
Other Segment Items	48,220	48,764	153,990	142,124
Pre-tax income (loss)	62,528	72,015	193,226	212,031
Capital Markets | Operating Segments
Revenue
Revenue	162,145	124,030	408,387	328,254
Less :
Compensation expenses	106,245	87,649	274,199	242,527
Other Segment Items	43,611	42,525	130,860	120,348
Pre-tax income (loss)	$ 12,289	$ (6,144)	$ 3,328	$ (34,621)