v3.26.3
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 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Revenues:        
Revenue from contracts with customers $ 1,000,806 $ 962,627 $ 3,023,102 $ 2,644,035
Other sources of revenue:        
Interest 510,624 481,504 1,437,766 1,434,192
Principal transactions 117,124 177,876 407,436 492,139
Other 6,615 12,558 71,296 24,311
Total revenues 1,635,169 1,634,565 4,939,600 4,594,677
Commissions [Member]        
Revenues:        
Revenue from contracts with customers 200,756 206,075 630,052 600,414
Investment Banking [Member]        
Revenues:        
Revenue from contracts with customers 306,203 323,483 979,569 794,885
Asset Management [Member]        
Revenues:        
Revenue from contracts with customers 492,163 431,399 1,408,250 1,244,548
Other [Member]        
Revenues:        
Revenue from contracts with customers $ 1,684 $ 1,670 $ 5,231 $ 4,188