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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, 2021
Dec. 31, 2020
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value $ 1,199,386 $ 694,028
U.S. Government Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 182,636 56,450
Corporate Fixed Income Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 318,288 194,575
Corporate Equity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 91,874 67,593
State and Municipal Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 162,821 96,150
Loans [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 18,854  
U.S. Government Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 16,829 46,900
Sovereign Debt [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 9,920  
Securities Sold, But Not yet Purchased [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Financial instruments owned, at fair value 721,028 437,978
Other [1] 8,147 11,303
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 44,638  
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 161,529 162,626
Securities Sold, But Not yet Purchased [Member] | Corporate Equity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Equity securities 30,813 30,848
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 366,014 91,974
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 109,887 141,227
Securities Owned [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Asset-backed securities 74,783 3,394
Financial instruments owned, at fair value 1,199,386 694,028
Securities Owned [Member] | U.S. Government Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 182,636 56,450
Securities Owned [Member] | Corporate Fixed Income Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Fixed income securities 318,288 194,575
Securities Owned [Member] | Corporate Equity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Equity securities 91,874 67,593
Securities Owned [Member] | State and Municipal Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
State and municipal securities 162,821 96,150
Securities Owned [Member] | Loans [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Fixed income securities 18,854 11,275
Securities Owned [Member] | U.S. Government Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 16,829 46,900
Securities Owned [Member] | Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 303,684 216,434
Securities Owned [Member] | Mortgage-Backed Securities [Member] | Non-Agency [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Trading securities owned 19,697 107
Securities Owned [Member] | Sovereign Debt [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Sovereign debt $ 9,920 $ 1,150
[1] Includes sovereign debt and state and municipal securities