Borrowed Funds (Summary Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Beginning Balance	$ 140,145		$ 140,146	[1]
Short-term FHLB Advances [Member]
Debt Instrument [Line Items]
Beginning Balance	140,000	$ 161,600	140,000
Average balance outstanding for the period	140,000	119,462	130,241
Maximum balance outstanding at any month end during period	$ 140,000	$ 161,600	$ 215,700
Weighted average interest rate for the period	0.37%	1.65%	0.67%
Weighted average interest rate for balances outstanding	0.38%	0.48%	0.35%
Federal Funds Purchased and Lines of Credit [Member]
Debt Instrument [Line Items]
Beginning Balance	$ 145	$ 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%	1.41%	0.50%
Weighted average interest rate for balances outstanding	0.25%	0.25%	0.25%

[1] Derived from audited consolidated financial statements