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Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Aug. 01, 2024 | Dec. 31, 2023
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | $ 1,394,091 |  | $ 1,394,091 |  |  | $ 1,388,243
Intangible assets | 117,167 |  | 117,167 |  |  | 133,279
Amortization of intangible assets | 5,900 | $ 4,800 | 17,710 | $ 13,872 |  |
Institutional Group [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | 1,059,082 |  | 1,059,082 |  |  | 1,053,234
Intangible assets | $ 91,785 |  | 91,785 |  |  | $ 104,592
Amortization of intangible assets |  |  | $ 14,405 |  |  |
Institutional Group [Member] | Acquired Business [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 7,500 |
Intangible assets |  |  |  |  | $ 7,500 |
Customer Relationships [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 9 years 7 months 6 days |  | 9 years 7 months 6 days |  |  |
Trade Names [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 6 years 7 months 6 days |  | 6 years 7 months 6 days |  |  |
Non-Compete Agreements [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 4 years 1 month 6 days |  | 4 years 1 month 6 days |  |  |
Acquired Technology [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 1 year 9 months 18 days |  | 1 year 9 months 18 days |  |  |
Core Deposits [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 8 months 12 days |  | 8 months 12 days |  |  |
Investment Banking Backlog [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets | 4 years 2 months 12 days |  | 4 years 2 months 12 days |  |  |

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