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, 2013	Dec. 31, 2012
Allowance for loan losses	$ 9,406	$ 8,145
Percentage of loan allowance losses	100.00%	100.00%
Commercial And Industrial [Member]
Allowance for loan losses	6,890	5,450
Percentage of loan allowance losses	41.30%	36.40%
Residential Real Estate [Member]
Allowance for loan losses	639	647
Percentage of loan allowance losses	47.50%	51.60%
Commercial Real Estate [Member]
Allowance for loan losses	423	408
Percentage of loan allowance losses	7.70%	8.00%
Consumer [Member]
Allowance for loan losses	356	691
Percentage of loan allowance losses	1.40%	1.50%
Home Equity Lines Of Credit [Member]
Allowance for loan losses	212	195
Percentage of loan allowance losses	2.00%	2.40%
Construction And Land [Member]
Allowance for loan losses	13	13
Percentage of loan allowance losses	0.10%	0.10%
Unallocated [Member]
Allowance for loan losses	$ 873	$ 741