Financial Derivatives (Schedule Of Derivative Instruments Subject To Master Netting Arrangement Or Repurchase Agreement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Financial Derivatives [Abstract]
Gross Amounts of Recognized Liabilities	$ 922	$ 1,103
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statements of Condition	922	1,103
Gross Amounts Not Offset in the Statements of Condition	922	1,103
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged	$ 0	$ 0