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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, 2023
Dec. 31, 2022
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value $ 1,144,898 $ 731,752
U.S. Government Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 351,095 73,608
Corporate Fixed Income Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 243,240 202,169
Corporate Equity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 40,392 38,129
State and Municipal Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 159,089 126,237
U.S. Government Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 24,571 38,956
Securities Sold, But Not yet Purchased [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Other [1] 5,867 5,817
Financial instruments owned, at fair value 665,487 454,817
Securities Sold, But Not yet Purchased [Member] | U.S. Government Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 12,889 3,971
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 116,263 134,381
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 16,067 11,590
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 445,251 254,265
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 69,150 44,793
Securities Owned [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Asset-backed securities 46,022 8,270
Other [2] 106,860 71,741
Financial instruments owned, at fair value 1,144,898 731,752
Securities Owned [Member] | U.S. Government Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 351,095 73,608
Securities Owned [Member] | Corporate Fixed Income Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Fixed income securities 243,240 202,169
Securities Owned [Member] | Corporate Equity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 40,392 38,129
Securities Owned [Member] | State and Municipal Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
State and municipal securities 159,089 126,237
Securities Owned [Member] | U.S. Government Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 24,571 38,956
Securities Owned [Member] | Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned $ 173,629 $ 172,642
[1] Includes syndicated loans and state and municipal securities.
[2] Includes syndicated loans, non-agency mortgage-backed securities, and sovereign debt.