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Revenues from contracts with customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 220,228		$ 659,664
Interest	13,403	$ 12,952	38,686	$ 36,346
Principal transactions, net	(16)	5,135	9,110	15,810
Other	4,199		7,440
Total other sources of revenue	17,586		55,236
Total revenue	237,814	226,220	714,900	655,365
Commissions from sales and trading
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	68,370		212,837
Mutual fund income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	11,308		33,098
Advisory fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	78,154		232,972
Investment banking - capital markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	18,539		56,970
Investment banking - advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	9,789		27,472
Bank deposit sweep income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	30,053		84,203
Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4,015		12,112
Private Client
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	144,568		434,811
Interest	9,469		27,820
Principal transactions, net	675		807
Other	3,371		5,292
Total other sources of revenue	13,515		33,919
Total revenue	158,083	147,428	468,730	425,069
Private Client | Commissions from sales and trading
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	36,553		115,924
Private Client | Mutual fund income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	11,059		32,327
Private Client | Advisory fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	60,516		180,426
Private Client | Investment banking - capital markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,733		10,572
Private Client | Investment banking - advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0		0
Private Client | Bank deposit sweep income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	30,053		84,203
Private Client | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,654		11,359
Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	17,870		53,219
Interest	0		1
Principal transactions, net	0		0
Other	0		0
Total other sources of revenue	0		1
Total revenue	17,870	19,277	53,220	57,247
Asset Management | Commissions from sales and trading
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0		0
Asset Management | Mutual fund income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	240		745
Asset Management | Advisory fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	17,627		52,465
Asset Management | Investment banking - capital markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0		0
Asset Management | Investment banking - advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0		0
Asset Management | Bank deposit sweep income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0		0
Asset Management | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3		9
Capital markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	57,727		171,514
Interest	3,678		10,146
Principal transactions, net	6,423		15,804
Other	302		401
Total other sources of revenue	10,403		26,351
Total revenue	68,130	$ 58,808	197,865	$ 168,418
Capital markets | Commissions from sales and trading
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	31,807		96,826
Capital markets | Mutual fund income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4		11
Capital markets | Advisory fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3		57
Capital markets | Investment banking - capital markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	15,806		46,398
Capital markets | Investment banking - advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	9,789		27,472
Capital markets | Bank deposit sweep income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0		0
Capital markets | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	318		750
Corporate/Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	63		120
Interest	256		719
Principal transactions, net	(7,114)		(7,501)
Other	526		1,747
Total other sources of revenue	(6,332)		(5,035)
Total revenue	(6,269)		(4,915)
Corporate/Other | Commissions from sales and trading
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	10		87
Corporate/Other | Mutual fund income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	5		15
Corporate/Other | Advisory fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	8		24
Corporate/Other | Investment banking - capital markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0		0
Corporate/Other | Investment banking - advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0		0
Corporate/Other | Bank deposit sweep income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0		0
Corporate/Other | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 40		$ (6)

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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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