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