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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Capital Expenditures	$ 14,560	$ 16,421	$ 28,646	$ 31,796
Depreciation	6,434	5,843	12,881	11,838
Amortization	11,284	10,611	22,296	20,969
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	8,454	10,108	17,166	18,610
Depreciation	3,199	2,976	6,380	6,073
Amortization	7,769	7,445	15,480	14,696
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	3,267	2,843	6,119	6,161
Depreciation	964	825	1,940	1,663
Amortization	2,585	2,459	5,138	4,859
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	696	1,068	1,492	2,015
Depreciation	339	298	673	601
Amortization	425	375	824	750
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,743	1,794	3,065	3,842
Depreciation	1,172	991	2,362	1,990
Amortization	275	250	541	500
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	121	132	215	283
Depreciation	547	571	1,095	1,134
Amortization	40	25	66	50
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	14,281	15,945	28,057	30,911
Depreciation	6,221	5,661	12,450	11,461
Amortization	11,094	10,554	22,049	20,855
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	279	476	589	885
Depreciation	213	182	431	377
Amortization	$ 190	$ 57	$ 247	$ 114

X

- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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