Bank Loans (Schedule of Balance and Associated Percentage of Each Major Loan Category in Loan Portfolio) (Details) (USD $)	Sep. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Jun. 30, 2011 Consumer [Member]		Dec. 31, 2010 Consumer [Member]		Sep. 30, 2011 Commercial And Industrial [Member]	Dec. 31, 2010 Commercial And Industrial [Member]	Sep. 30, 2011 Residential Real Estate [Member]	Dec. 31, 2010 Residential Real Estate [Member]	Sep. 30, 2011 Home Equity Lines Of Credit [Member]	Dec. 31, 2010 Home Equity Lines Of Credit [Member]	Sep. 30, 2011 Commercial Real Estate [Member]	Dec. 31, 2010 Commercial Real Estate [Member]	Sep. 30, 2011 Construction And Land [Member]	Dec. 31, 2010 Construction And Land [Member]
Loans and Leases Receivable, Gross, Carrying Amount, Consumer							$ 364,288,000	[1]	$ 266,806,000	[1]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial and Industrial											125,388,000	41,965,000
Loans and Leases Receivable, Gross, Carrying Amount, Residential Real Estate													53,185,000	49,550,000
Loans and Leases Receivable, Gross, Carrying Amount, Home Equity Lines of Credit															25,386,000	30,966,000
Loans and Leases Receivable, Gross, Carrying Amount, Commercial Real Estate																	3,306,000	1,637,000
Loans and Leases Receivable, Gross, Carrying Amount, Construction and Land																			514,000	524,000
Loans and leases receivable, gross, carrying amount	572,067,000		391,448,000
Loans and Leases Receivable, Gross, Carrying Amount, Consumer, Percentage of Total							63.70%	[1]	68.20%	[1]
Loans and Leases Receivable, Gross, Carrying Amount, Commercial and Industrial, Percentage of Total											21.90%	10.70%
Loans and Leases Receivable, Gross, Carrying Amount, Residential Real Estate, Percentage of Total													9.30%	12.70%
Loans and Leases Receivable, Gross, Carrying Amount, Home Equity Lines of Credit, Percentage of Total															4.40%	7.90%
Loans And Leases Receivable Gross Carrying Amount Commercial Real Estate Percentage Of Total																	0.60%	0.40%
Loans and Leases Receivable, Gross, Carrying Amount, Construction and Land, Percentage of Total																			0.10%	0.10%
Unamortized loan origination costs, net of loan fees	66,000		392,000
Loans in process	(10,000)		233,000
Allowance for loan losses	(3,830,000)	(3,251,000)	(2,331,000)	(1,823,000)	(1,669,000)	(1,702,000)
Loans and leases receivable, net reported amount	568,293,000		389,742,000
Loans and leases receivable reported percentage	100.00%		100.00%
Securities-based loans	$ 364,000,000		$ 266,100,000

[1] Includes securities-based loans of $364.0 million and $266.1 million at September 30, 2011 and December 31, 2010, respectively.