Borrowed Funds (Summary Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Beginning Balance	$ 161,745		$ 199,345	[1]
Short-term FHLB Advances [Member]
Debt Instrument [Line Items]
Beginning Balance	161,600	$ 186,150	199,200
Average balance outstanding for the period	119,462	198,878	193,992
Maximum balance outstanding at any month end during period	$ 161,600	$ 190,000	$ 237,400
Weighted average interest rate for the period	1.65%	2.71%	2.48%
Weighted average interest rate for balances outstanding	0.48%	2.75%	1.83%
Federal Funds Purchased and Lines of Credit [Member]
Debt Instrument [Line Items]
Beginning Balance	$ 145	$ 142	$ 145
Average balance outstanding for the period	145	1,419	458
Maximum balance outstanding at any month end during period	$ 145	$ 142	$ 145
Weighted average interest rate for the period	1.41%	2.47%	2.43%
Weighted average interest rate for balances outstanding	0.25%	2.50%	1.75%

[1] Derived from audited consolidated financial statements