Bank Loans (Activity In The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	$ 20,731	$ 12,668
Provision	9,069	8,531
Charge- offs	(144)	(531)
Recoveries	131	63
Ending Balance	29,787	20,731
Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	16,609	9,832
Provision	8,139	7,287
Charge- offs		(510)
Ending Balance	24,748	16,609
Securities Based Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	1,099	893
Provision	508	211
Charge- offs		(5)
Ending Balance	1,607	1,099
Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	156
Provision	(58)	172
Charge- offs		(16)
Recoveries	7
Ending Balance	105	156
Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	787	408
Provision	544	373
Charge- offs	(144)
Recoveries	54	6
Ending Balance	1,241	787
Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	232	198
Provision	(30)	(23)
Recoveries	62	57
Ending Balance	264	232
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	267	174
Provision	15	93
Recoveries	8
Ending Balance	290	267
Construction And Land [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance		12
Provision	78	(12)
Ending Balance	78
Qualitative [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning Balance	1,581	1,151
Provision	(127)	430
Ending Balance	$ 1,454	$ 1,581