Bank Loans (Schedule Of Balance And Associated Percentage Of Each Major Loan Category In Loan Portfolio) (Details) (USD $)	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011	Dec. 31, 2010
Loans and Leases Receivable, Gross, Carrying Amount, Consumer	$ 385,231,000	[1]	$ 371,399,000	[1]
Loans and Leases Receivable, Gross, Carrying Amount, Total	663,600,000		637,857,000
Loans and Leases Receivable, Gross, Carrying Amount, Consumer, Percentage of Total	58.10%	[1]	58.20%	[1]
Unamortized loan origination costs, net of loan fees	(537,000)		(421,000)
Loans in process	(89,000)		4,000
Allowance for loan losses	(5,781,000)		(5,300,000)		(2,521,000)	(2,331,000)
Loans and leases receivable, net reported amount	657,193,000		632,140,000
Loans and leases receivable reported percentage			100.00%
Securities-based loans	384,900,000		371,100,000
Commercial And Industrial [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial and Industrial	203,559,000		186,996,000
Loans and Leases Receivable, Gross, Carrying Amount, Commercial and Industrial, Percentage of Total	30.70%		29.30%
Residential Real Estate [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Residential Real Estate	47,200,000		51,755,000
Loans and Leases Receivable, Gross, Carrying Amount, Residential Real Estate, Percentage of Total	7.10%		8.10%
Home Equity Lines Of Credit [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Home Equity Lines of Credit	24,100,000		24,086,000
Loans and Leases Receivable, Gross, Carrying Amount, Home Equity Lines of Credit, Percentage of Total	3.60%		3.80%
Commercial Real Estate [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial Real Estate	2,996,000		3,107,000
Loans And Leases Receivable Gross Carrying Amount Commercial Real Estate Percentage Of Total	0.40%		0.50%
Construction And Land [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Construction and Land	$ 514,000		$ 514,000
Loans and Leases Receivable, Gross, Carrying Amount, Construction and Land, Percentage of Total	0.10%		0.10%

[1] Includes securities-based loans of $384.9 million and $371.1 million at March 31, 2012 and December 31, 2011, respectively.