Borrowed Funds (Summary Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Beginning Balance	$ 238,403		$ 250,499	[1]
Short-term FHLB Advances [Member]
Debt Instrument [Line Items]
Beginning Balance	233,300	$ 199,500	247,000
Average balance outstanding for the period	209,877	196,728	201,712
Maximum balance outstanding at any month end during period	$ 262,000	$ 229,300	$ 247,000
Weighted average interest rate for the period	2.01%	1.10%	1.19%
Weighted average interest rate for balances outstanding	2.41%	1.32%	1.60%
Federal Funds Purchased and Lines of Credit [Member]
Debt Instrument [Line Items]
Beginning Balance	$ 5,103	$ 3,488	$ 3,499
Average balance outstanding for the period	4,128	3,474	3,512
Maximum balance outstanding at any month end during period	$ 7,534	$ 3,488	$ 3,499
Weighted average interest rate for the period	1.80%	1.03%	1.10%
Weighted average interest rate for balances outstanding	2.25%	1.25%	1.50%
Repurchase Agreements [Member]
Debt Instrument [Line Items]
Beginning Balance			$ 0
Average balance outstanding for the period			519
Maximum balance outstanding at any month end during period			$ 0
Weighted average interest rate for the period			0.12%
Weighted average interest rate for balances outstanding			0.00%

[1] Derived from audited consolidated financial statements