Borrowed Funds (Summary Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Beginning Balance	$ 140,145		$ 199,345	[1]
Short-term FHLB Advances [Member]
Debt Instrument [Line Items]
Beginning Balance	140,000	$ 206,550	199,200
Average balance outstanding for the period	126,964	196,058	193,992
Maximum balance outstanding at any month end during period	$ 215,700	$ 225,200	$ 237,400
Weighted average interest rate for the period	0.79%	2.63%	2.48%
Weighted average interest rate for balances outstanding	0.36%	2.15%	1.83%
Federal Funds Purchased and Lines of Credit [Member]
Debt Instrument [Line Items]
Beginning Balance	$ 145	$ 144	$ 145
Average balance outstanding for the period	145	564	458
Maximum balance outstanding at any month end during period	$ 145	$ 144	$ 145
Weighted average interest rate for the period	0.64%	2.48%	2.43%
Weighted average interest rate for balances outstanding	0.25%	2.00%	1.75%

[1] Derived from audited consolidated financial statements