Bank Loans (Schedule Of The Allowances For Loan Losses By Type)(Details) (USD $)	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Percentage of loan allowance losses	100.00%	[1]
Allowance for loan losses	$ 5,781.0		$ 5,300,000
Unallocated [Member]
Percentage of loan allowance losses	3.70%	[1]	3.90%	[1]
Allowance for loan losses	856,000		883,000
Consumer [Member]
Percentage of loan allowance losses	58.10%	[1]	58.20%	[1]
Allowance for loan losses	785,000		510,000
Commercial And Industrial [Member]
Percentage of loan allowance losses	30.70%	[1]	29.30%	[1]
Allowance for loan losses	2,908,000		2,595,000
Residential Real Estate [Member]
Percentage of loan allowance losses	7.10%	[1]	8.10%	[1]
Allowance for loan losses	667,000		679,000
Commercial Real Estate [Member]
Percentage of loan allowance losses	0.40%	[1]	0.50%	[1]
Allowance for loan losses	$ 565,000		$ 633,000

[1] Loan category as a percentage of total loan portfolio.