Borrowed Funds (Summary Of Comparative Data For Federal Funds Purchased) (Details) (Federal Funds Purchased [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Federal Funds Purchased [Member]
Borrowed Funds [Line Items]
Average amount outstanding during the year	$ 27	[1]		$ 8,392	[1]
Maximum amount outstanding at month-end				85,000	[2]
Balance, December 31
Weighted-average interest rate for the year	1.29%		0.00%	0.27%

[1] Average balances were computed using daily averages.

[2] Highest month-end balances were April 2009.