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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
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Financial instruments owned, at fair value $ 997,686   $ 1,157,004
U.S. Government Agency Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Financial instruments owned, at fair value 137,765   143,793
Corporate Fixed Income Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Financial instruments owned, at fair value 219,271   255,999
Corporate Equity Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Financial instruments owned, at fair value 44,103   75,056
State and Municipal Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Financial instruments owned, at fair value   $ 113,846 162,335
U.S. Government Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Financial instruments owned, at fair value 40,140   10,774
Securities Sold, But Not yet Purchased [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Other [1] 4,824   2,770
Financial instruments owned, at fair value 637,714   756,150
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 31,076   37,395
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 129,110   153,852
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 15,794   28,482
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 378,885   377,023
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 78,025   156,628
Securities Owned [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Asset-backed securities 124,339   132,087
Other [2] 76,845   41,910
Financial instruments owned, at fair value 997,686   1,157,004
Securities Owned [Member] | U.S. Government Agency Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Trading securities owned 137,765   143,793
Securities Owned [Member] | Corporate Fixed Income Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Fixed income securities 219,271   255,999
Securities Owned [Member] | Corporate Equity Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Financial instruments owned, at fair value 44,103   75,056
Securities Owned [Member] | State and Municipal Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
State and municipal securities 113,846   162,335
Securities Owned [Member] | U.S. Government Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Trading securities owned 40,140   10,774
Securities Owned [Member] | Mortgage-Backed Securities [Member] | Agency Securities [Member]      
Schedule Of Trading Securities And Other Trading Assets [Line Items]      
Trading securities owned $ 241,377   $ 335,050
[1] Includes loans, state and municipal securities, and sovereign debt.
[2] Includes loans, non-agency mortgage-backed securities, and sovereign debt.