Interest Rate Swap Derivatives (Schedule Of Notional Amounts Of Outstanding Derivative Positions) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Derivative [Line Items]
Swap fee income	$ (256)	$ (666)
Collateral already posted, fair value	6,300		$ 5,000
Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Asset derivative, notional/contract amount	263,281		256,950
Liability derivatives, notional/contract amount	263,281		256,950
Not Designated as Hedging Instrument | Interest Rate Swap | Other Assets
Derivative [Line Items]
Asset derivative, fair value	3,053		5,239
Not Designated as Hedging Instrument | Interest Rate Swap | Other Liabilities
Derivative [Line Items]
Liability derivatives, fair value	$ 3,053		$ 5,239