Bank Loans (Schedule Of Balance And Associated Percentage Of Each Major Loan Category In Loan Portfolio) (Details) - USD ($) $ in Thousands		Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2014		Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross Carrying Amount, Total		$ 2,475,815			$ 2,116,634		$ 1,816,666
Unamortized loan discount		(29,180)			(30,533)
Unamortized loan fees, net of loan fees		(1,819)			(1,631)
Loans in process		(567)			1,681
Allowance for loan losses		(23,923)		$ (22,567)	(20,731)		(17,104)	$ (14,131)	$ (12,668)
Loans and leases receivable, net reported amount		$ 2,420,326			$ 2,065,420
Loans and Lease Receivable, Gross Carrying Amount, Percentage of Total		100.00%			100.00%
Securities-based loans		$ 963,100			$ 732,800
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross Carrying Amount, Total		1,010,810			896,853		750,071
Allowance for loan losses		$ (19,297)		(18,104)	$ (16,609)		(13,525)	(11,089)	(9,832)
Loans and Lease Receivable, Gross Carrying Amount, Percentage of Total		40.80%			42.40%
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross Carrying Amount, Total		$ 983,359	[1]		$ 758,288	[1]	624,700
Allowance for loan losses		$ (1,568)		(1,392)	$ (1,255)		(937)	(800)	(892)
Loans and Lease Receivable, Gross Carrying Amount, Percentage of Total	[1]	39.70%			35.80%
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross Carrying Amount, Total		$ 448,994			$ 432,646		411,439
Allowance for loan losses		$ (904)		(857)	$ (787)		(564)	(473)	(408)
Loans and Lease Receivable, Gross Carrying Amount, Percentage of Total		18.10%			20.40%
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross Carrying Amount, Total		$ 20,053			$ 15,902		16,055
Allowance for loan losses		$ (286)		(305)	$ (232)		(243)	(194)	(198)
Loans and Lease Receivable, Gross Carrying Amount, Percentage of Total		0.80%			0.80%
Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross Carrying Amount, Total		$ 12,599			$ 12,945		14,401
Allowance for loan losses		$ (265)		$ (269)	$ (267)		$ (280)	$ (290)	$ (174)
Loans and Lease Receivable, Gross Carrying Amount, Percentage of Total		0.50%			0.60%

[1] Includes securities-based loans of $ 963.1 million and $732.8 million at June 30, 2015 and December 31, 2014, respectively.