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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
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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.

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