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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Capital Expenditures	$ 17,958	$ 13,165	$ 25,750	$ 34,558
Depreciation	5,730	5,630	11,434	11,062
Amortization	8,427	7,407	16,669	15,029
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	11,852	8,180	16,703	20,022
Depreciation	3,947	3,704	7,880	7,432
Amortization	5,457	4,794	10,793	9,479
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	4,192	2,805	5,967	6,946
Depreciation	517	492	1,026	986
Amortization	2,001	1,757	3,958	3,473
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	781	636	1,144	1,867
Depreciation	222	251	452	513
Amortization	309	302	611	604
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	852	1,110	1,475	4,163
Depreciation	474	492	936	968
Amortization	206	201	408	402
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	187	148	275	420
Depreciation	454	490	908	824
Amortization	397	296	785	573
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	17,864	12,879	25,564	33,418
Depreciation	5,614	5,429	11,202	10,723
Amortization	8,370	7,350	16,555	14,531
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	94	286	186	1,140
Depreciation	116	201	232	339
Amortization	$ 57	$ 57	$ 114	$ 498