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Revenues from Contracts with Customers (Revenues from Contracts with Customers Disaggregated by Major Business Activity and Primary Geographic Regions) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation Of Revenue [Line Items]
Commissions	$ 200,669	$ 183,317	$ 394,339	$ 368,793
Investment banking	233,460	233,281	471,402	447,230
Revenue from contracts with customers	838,918	798,917	1,681,408	1,567,054
Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	106,155	101,870	206,627	196,567
Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	127,305	131,411	264,775	250,663
Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	403,608	380,757	813,149	748,233
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	1,181	1,562	2,518	2,798
Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Commissions	128,203	121,465	254,029	242,682
Investment banking	6,224	5,780	12,132	10,060
Revenue from contracts with customers	539,182	509,544	1,081,717	1,003,727
Global Wealth Management [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	6,224	5,780	12,132	10,060
Global Wealth Management [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	403,574	380,737	813,080	748,187
Global Wealth Management [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	1,181	1,562	2,476	2,798
Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Commissions	72,466	61,852	140,310	126,111
Investment banking	227,236	227,501	459,270	437,170
Revenue from contracts with customers	299,736	289,373	599,649	563,327
Institutional Group [Member] | Capital Raising [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	99,931	96,090	194,495	186,507
Institutional Group [Member] | Advisory [Member]
Disaggregation Of Revenue [Line Items]
Investment banking	127,305	131,411	264,775	250,663
Institutional Group [Member] | Asset Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	34	20	69	46
Institutional Group [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers			42
Other [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers			42
United States [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	787,818	743,642	1,570,897	1,461,275
United States [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	539,182	509,544	1,081,717	1,003,727
United States [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	248,636	234,098	489,138	457,548
United States [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers			42
United Kingdom [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	32,317	33,386	67,881	61,571
United Kingdom [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	32,317	33,386	67,881	61,571
Canada [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	9,786	9,712	26,658	21,087
Canada [Member] | Global Wealth Management [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	0	0
Canada [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	9,786	9,712	26,658	21,087
Other [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	8,997	12,177	15,972	23,121
Other [Member] | Institutional Group [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	$ 8,997	$ 12,177	$ 15,972	$ 23,121

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- Definition

Amount of commission revenue from buying and selling securities on behalf of customers.

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