Investment Securities (Equity in Earnings of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity in (losses) earnings from investments	$ (4,995)	$ 2,675	$ 56,268
Mutual fund and hedge funds
Schedule of Equity Method Investments [Line Items]
Equity in (losses) earnings from investments	(4,995)	2,675	2,844
Ladenburg Thalmann Financial Services Inc.
Schedule of Equity Method Investments [Line Items]
Equity in (losses) earnings from investments	$ 0	$ 0	$ 53,424