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Revenues from Contracts with Customers (Schedule of Total Revenues Broken Out by Revenues from Contracts with Customers and Other Sources of Revenues) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenues:        
Revenue from contracts with customers $ 838,918 $ 798,917 $ 1,681,408 $ 1,567,054
Other sources of revenue:        
Interest 477,056 498,152 952,688 1,004,980
Principal transactions 172,603 153,574 314,263 292,588
Other 2,509 14,618 11,753 18,332
Total revenues 1,491,086 1,465,261 2,960,112 2,882,954
Commissions [Member]        
Revenues:        
Revenue from contracts with customers 200,669 183,317 394,339 368,793
Investment Banking [Member]        
Revenues:        
Revenue from contracts with customers 233,460 233,281 471,402 447,230
Asset Management [Member]        
Revenues:        
Revenue from contracts with customers 403,608 380,757 813,149 748,233
Other [Member]        
Revenues:        
Revenue from contracts with customers $ 1,181 $ 1,562 $ 2,518 $ 2,798