Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Capital Expenditures	$ 54,074	$ 53,225	$ 52,340
Depreciation	22,586	21,471	21,902
Amortization	33,258	27,288	24,048
Assets	1,309,824	1,294,559
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	32,509	35,045	32,982
Depreciation	15,226	15,648	15,704
Amortization	22,218	18,081	15,100
Assets	481,602	457,333
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	11,193	11,933	11,691
Depreciation	1,981	2,251	2,384
Amortization	7,167	6,201	5,467
Assets	120,255	119,053
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	2,781	2,059	2,601
Depreciation	1,012	1,079	1,170
Amortization	1,208	864	1,213
Assets	99,461	80,133
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	5,494	3,081	3,659
Depreciation	1,914	1,809	1,891
Amortization	804	580	820
Assets	118,221	95,760
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	632	577	608
Depreciation	1,716	114	148
Amortization	1,249	433	477
Assets	5,846	5,962
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	52,609	52,695	51,541
Depreciation	21,849	20,901	21,297
Amortization	32,646	26,159	23,077
Assets	825,385	758,241
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,465	530	799
Depreciation	737	570	605
Amortization	612	1,129	971
Assets	$ 484,439	$ 536,318