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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands | Aug. 01, 2024 | Aug. 01, 2023 | Mar. 01, 2023 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 1,395,218 | $ 1,388,243
Institutional Group [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 1,060,209 | $ 1,053,234
CB Resource and Finance 500 [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date of acquisition | Aug. 01, 2024 |  |  |  |
Payments to Acquire Intangible Assets | $ 4,500 |  |  |  |
CB Resource and Finance 500 [Member] | Institutional Group [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 6,800 |  |  |  |
Sierra Pacific Securities, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date of acquisition |  | Aug. 01, 2023 |  |  |
Payments to Acquire Intangible Assets |  | $ 18,100 |  |  |
Sierra Pacific Securities, LLC [Member] | Institutional Group [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 6,800 |  |  |
Torreya Partners, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date of acquisition |  |  | Mar. 01, 2023 |  |
Payments to Acquire Intangible Assets |  |  | $ 5,300 |  |
Torreya Partners, LLC [Member] | Institutional Group [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 55,100 |  |

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