Borrowed Funds (Summary Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Balance at December 31	$ 250,499	$ 224,461
Short-term FHLB Advances [Member]
Debt Instrument [Line Items]
Balance at December 31	247,000	221,000
Average balance outstanding for the period	201,712	187,420
Maximum balance outstanding at any month end during period	$ 247,000	$ 231,200
Weighted average interest rate for the period	1.19%	0.60%
Weighted average interest rate for balances outstanding	1.60%	0.79%
Repurchase Agreements [Member]
Debt Instrument [Line Items]
Balance at December 31	$ 0
Average balance outstanding for the period	519
Maximum balance outstanding at any month end during period	0
Federal Funds Purchased and Lines of Credit [Member]
Debt Instrument [Line Items]
Balance at December 31	3,499	$ 3,461
Average balance outstanding for the period	3,512	3,456
Maximum balance outstanding at any month end during period	$ 3,499	$ 3,462
Weighted average interest rate for the period	1.10%	0.51%
Weighted average interest rate for balances outstanding	1.50%	0.75%