Bank Loans (Schedule Of The Allowances For Loan Losses By Type) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for loan losses	$ 22,567	$ 20,731
Percentage of loan allowance losses	100.00%	100.00%
Commercial And Industrial [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for loan losses	18,104	16,609
Percentage of loan allowance losses	41.50%	42.40%
Consumer [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for loan losses	1,392	1,255
Percentage of loan allowance losses	37.90%	35.80%
Residential Real Estate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for loan losses	857	787
Percentage of loan allowance losses	19.10%	20.40%
Home Equity Lines Of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for loan losses	269	267
Percentage of loan allowance losses	0.60%	0.80%
Commercial Real Estate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for loan losses	305	232
Percentage of loan allowance losses	0.90%	0.60%
Construction And Land [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Percentage of loan allowance losses	0.00%	0.00%
Qualitative [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance for loan losses	$ 1,640	$ 1,581