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Financial Instruments Owned and Financial Instruments Sold, But Not Yet Purchased (Components of Trading Securities Owned and Trading Securities Sold, But Not Yet Purchased) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value $ 1,261,216 $ 918,741
U.S. Government Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 194,979 106,634
Corporate Fixed Income Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 293,994 237,671
Corporate Equity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 69,216 52,520
State and Municipal Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 271,417 223,155
U.S. Government Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 10,901 32,411
Securities Sold, But Not yet Purchased [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Other [1] 4,073 11,489
Financial instruments owned, at fair value 634,311 497,741
Securities Sold, But Not yet Purchased [Member] | Corporate Fixed Income Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Fixed income securities 133,943 138,359
Securities Sold, But Not yet Purchased [Member] | Corporate Equity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 29,122 21,576
Securities Sold, But Not yet Purchased [Member] | U.S. Government Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 392,431 273,653
Securities Sold, But Not yet Purchased [Member] | Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 74,742 52,664
Securities Owned [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Asset-backed securities 89,007 19,604
Other [2] 72,496 86,843
Financial instruments owned, at fair value 1,261,216 918,741
Securities Owned [Member] | U.S. Government Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 194,979 106,634
Securities Owned [Member] | Corporate Fixed Income Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Fixed income securities 293,994 237,671
Securities Owned [Member] | Corporate Equity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 69,216 52,520
Securities Owned [Member] | State and Municipal Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
State and municipal securities 271,417 223,155
Securities Owned [Member] | U.S. Government Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 10,901 32,411
Securities Owned [Member] | Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned $ 259,206 $ 159,903
[1] Includes syndicated loans, sovereign debt, state and municipal securities, and asset-backed securities.
[2] Includes syndicated loans, non-agency mortgage-backed securities, and sovereign debt.