Investment Securities (Equity in (Losses) Earnings of Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity in (losses) earnings from investments	$ (2,242)	$ 577
Mutual fund and hedge funds
Schedule of Equity Method Investments [Line Items]
Equity in (losses) earnings from investments	$ (2,242)	$ 577

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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