Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 02, 2025	Apr. 07, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Schedule of Goodwill and Intangible Assets [Line Items]
Amortization of intangible assets			$ 5,500	$ 6,000	$ 10,937	$ 11,838
B Riley Financial Inc. [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Date of acquisition		Apr. 07, 2025
Bryan Garnier [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Date of acquisition	Jun. 02, 2025
Liability for estimated earn-out payments	$ 25,000
Estimated future operating results	5 years
Customer Relationships [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			8 years 9 months 18 days		8 years 9 months 18 days
Trade Names [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			5 years 9 months 18 days		5 years 9 months 18 days
Non-Compete Agreements [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			3 years 6 months		3 years 6 months
Acquired Technology [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			8 years 2 months 12 days		8 years 2 months 12 days
Core Deposits [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			1 month 6 days		1 month 6 days
Investment Banking Backlog [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Weighted-average remaining lives of intangible assets			8 months 12 days		8 months 12 days