v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenues:        
Revenue from contracts with customers $ 1,011,937 $ 838,918 $ 2,022,296 $ 1,681,408
Other sources of revenue:        
Interest 476,093 477,056 927,142 952,688
Principal transactions 140,091 172,603 290,312 314,263
Other 10,658 2,509 64,681 11,753
Total revenues 1,638,779 1,491,086 3,304,431 2,960,112
Commissions [Member]        
Revenues:        
Revenue from contracts with customers 221,462 200,669 429,296 394,339
Investment Banking [Member]        
Revenues:        
Revenue from contracts with customers 331,954 233,460 673,366 471,402
Asset Management [Member]        
Revenues:        
Revenue from contracts with customers 456,630 403,608 916,087 813,149
Other [Member]        
Revenues:        
Revenue from contracts with customers $ 1,891 $ 1,181 $ 3,547 $ 2,518