Segment Operating Results - Segment Contribution Footnotes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Other Revenue, net	$ 81,246	$ (24,228)	$ 19,196
Special Charges, Including Business Realignment Costs	2,921	3,126	8,554
Acquisition and Transition Costs	0	0	7
Total Other Expenses	2,921	3,126	8,561
Investment Banking and Equities [Member]
Segment Reporting Information [Line Items]
Other Revenue, net	78,281	(25,668)	19,370
Interest expense on Notes Payable and Line of Credit	16,717	16,850	17,586
Special Charges, Including Business Realignment Costs	2,921	3,126	0
Acquisition and Transition Costs	0	0	7
Total Other Expenses	2,921	3,126	7
Investment Management [Member]
Segment Reporting Information [Line Items]
Other Revenue, net	2,965	1,440	(174)
Special Charges, Including Business Realignment Costs	0	0	8,554
Total Other Expenses	$ 0	$ 0	$ 8,554