Bank Loans (Schedule of Balance and Associated Percentage of Each Major Loan Category in Loan Portfolio) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Loans and Leases Recievable_percentage total	$ 100.0	$ 100.0
Loans and Leases Receivable, Unallocated, Percentage	3.9	8.0
Loans and Leases Receivable, Gross, Carrying Amount, Consumer		266,806,000
Loans and Leases Receivable, Gross, Carrying Amount, Commercial and Industrial		41,965,000
Loans and Leases Receivable, Gross, Carrying Amount, Residential Real Estate		49,550,000
Loans and Leases Receivable, Gross, Carrying Amount, Home Equity Lines of Credit		30,966,000
Loans and Leases Receivable, Gross, Carrying Amount, Commercial Real Estate		1,637,000
Loans and Leases Receivable, Gross, Carrying Amount, Construction and Land		524,000
Loans and leases receivable, gross, carrying amount	637,857,000	391,448,000
Loans and Leases Receivable, Gross, Carrying Amount, Consumer, Percentage of Total	58.20%	68.20%
Loans and Leases Receivable, Gross, Carrying Amount, Commercial and Industrial, Percentage of Total	29.30%	10.70%
Loans and Leases Receivable, Gross, Carrying Amount, Residential Real Estate, Percentage of Total	8.10%	12.70%
Loans and Leases Receivable, Gross, Carrying Amount, Home Equity Lines of Credit, Percentage of Total		7.90%
Loans And Leases Receivable Gross Carrying Amount Commercial Real Estate Percentage Of Total	0.50%	0.40%
Loans and Leases Receivable, Gross, Carrying Amount, Construction and Land, Percentage of Total		0.10%
Unamortized loan origination costs, net of loan fees	(421,000)	392,000
Loans in process	4,000	233,000
Loans and leases receivable, net reported amount	632,140,000
Securities-based loans	371,100,000	266,100,000
Consumer [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Consumer	371,399,000
Commercial And Industrial [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial and Industrial	186,996,000
Residential Real Estate [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Residential Real Estate	51,755,000
Home Equity Lines Of Credit [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Home Equity Lines of Credit	24,086,000
Commercial Real Estate [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial Real Estate	3,107,000
Construction And Land [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Construction and Land	$ 514,000