Assets And Liabilities Subject To Offsetting (Schedule Of Securities Sold Under Agreements To Repurchase) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Offsetting Liabilities [Line Items]
Repurchase Agreements, Gross Amounts of Recognized Liabilities	$ 8,624	$ 10,295
Repurchase Agreements, Gross Amounts Offset in the Statements of Condition	0	0
Repurchase Agreements, Net Amounts of Liabilities Presented in the Statements of Condition	8,624	10,295
Repurchase Agreements, Gross amounts Not Offset in the Statements of Condition, Cash Collateral Pledged	0	0
Repurchase Agreements, Net Amount	0	0
U.S. Agency Mortgage-Backed, Residential [Member]
Offsetting Liabilities [Line Items]
Repurchase Agreements, Gross amounts Not Offset in the Statements of Condition, Financial Instruments	(8,624)	(10,295)
U.S. Agency [Member]
Offsetting Liabilities [Line Items]
Repurchase Agreements, Gross amounts Not Offset in the Statements of Condition, Financial Instruments	$ 0	$ 0