Borrowed Funds (Summary Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Beginning Balance	$ 140,146		$ 140,146	[1]
Short-term FHLB Advances [Member]
Debt Instrument [Line Items]
Beginning Balance	140,000	$ 140,000	140,000
Average balance outstanding for the period	140,000	126,964	130,241
Maximum balance outstanding at any month end during period	$ 140,000	$ 215,700	$ 215,700
Weighted average interest rate for the period	0.34%	0.79%	0.67%
Weighted average interest rate for balances outstanding	0.32%	0.36%	0.35%
Federal Funds Purchased and Lines of Credit [Member]
Debt Instrument [Line Items]
Beginning Balance	$ 146	$ 145	$ 146
Average balance outstanding for the period	146	145	170
Maximum balance outstanding at any month end during period	$ 146	$ 145	$ 146
Weighted average interest rate for the period	0.25%	0.64%	0.50%
Weighted average interest rate for balances outstanding	0.25%	0.25%	0.25%

[1] Derived from audited consolidated financial statements