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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
Mar. 31, 2024
Mar. 31, 2023
Revenues:    
Revenue from contracts with customers $ 768,137 $ 698,225
Other sources of revenue:    
Interest 506,828 451,564
Principal transactions 139,014 115,522
Other 3,714 (3,520)
Total revenues 1,417,693 1,261,791
Commissions [Member]    
Revenues:    
Revenue from contracts with customers 185,476 169,550
Investment Banking [Member]    
Revenues:    
Revenue from contracts with customers 213,949 211,879
Asset Management [Member]    
Revenues:    
Revenue from contracts with customers 367,476 315,569
Other [Member]    
Revenues:    
Revenue from contracts with customers $ 1,236 $ 1,227