Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Capital Expenditures	$ 15,721	$ 15,707	$ 52,615	$ 41,457
Depreciation	5,579	5,616	16,494	17,050
Amortization	9,813	8,829	28,611	25,498
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	7,797	9,376	26,105	26,079
Depreciation	2,922	3,799	10,211	11,679
Amortization	6,342	5,704	18,485	16,497
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	3,731	3,513	11,381	9,480
Depreciation	759	521	1,762	1,547
Amortization	2,341	2,105	6,825	6,063
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	239	777	3,169	1,921
Depreciation	295	222	714	674
Amortization	363	326	1,058	937
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	3,115	1,596	8,337	3,071
Depreciation	907	525	1,931	1,461
Amortization	242	218	706	626
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	498	186	1,694	461
Depreciation	511	442	1,461	1,350
Amortization	468	419	1,366	1,204
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	15,380	15,448	50,686	41,012
Depreciation	5,394	5,509	16,079	16,711
Amortization	9,756	8,772	28,440	25,327
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	341	259	1,929	445
Depreciation	185	107	415	339
Amortization	$ 57	$ 57	$ 171	$ 171

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.

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)

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- Definition

Future cash outflow to pay for purchases of fixed assets that have occurred.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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