Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Capital Expenditures	$ 13,165	$ 9,487	$ 34,558	$ 27,510
Depreciation	5,630	5,391	11,062	11,002
Amortization	7,407	6,792	15,029	13,023
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	8,180	6,783	20,022	17,813
Depreciation	3,704	3,962	7,432	8,000
Amortization	4,794	4,608	9,479	8,837
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	2,805	2,296	6,946	6,038
Depreciation	492	556	986	1,147
Amortization	1,757	1,551	3,473	2,969
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	636	251	1,867	1,132
Depreciation	251	268	513	560
Amortization	302	196	604	363
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,110	89	4,163	1,873
Depreciation	492	435	968	938
Amortization	201	131	402	246
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	148	92	420	304
Depreciation	490	29	824	59
Amortization	296	65	573	124
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	12,879	9,511	33,418	27,160
Depreciation	5,429	5,250	10,723	10,704
Amortization	7,350	6,551	14,531	12,539
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	286	(24)	1,140	350
Depreciation	201	141	339	298
Amortization	$ 57	$ 241	$ 498	$ 484