Borrowed Funds (Summary Of Short-Term Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Beginning Balance	$ 186,292		$ 309,084	[1]
Short-term FHLB Advances [Member]
Debt Instrument [Line Items]
Beginning Balance	186,150	$ 190,000	303,950
Average balance outstanding for the period	198,878	240,179	223,764
Maximum balance outstanding at any month end during period	$ 190,000	$ 262,000	$ 303,950
Weighted average interest rate for the period	2.71%	1.72%	2.18%
Weighted average interest rate for balances outstanding	2.75%	2.02%	2.71%
Federal Funds Purchased and Lines of Credit [Member]
Debt Instrument [Line Items]
Beginning Balance	$ 142	$ 3,513	$ 5,134
Average balance outstanding for the period	1,419	3,506	4,378
Maximum balance outstanding at any month end during period	$ 142	$ 3,513	$ 7,534
Weighted average interest rate for the period	2.47%	1.50%	1.95%
Weighted average interest rate for balances outstanding	2.50%	1.75%	2.50%

[1] Derived from audited consolidated financial statements