Short-Term Borrowings (Summary Of Short-Term Borrowings) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Short-term Debt [Line Items]
Total short-term borrowings	$ 313,520	$ 312,945
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate	0.45%	0.78%
Total short-term borrowings	293,800	292,690
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Short-term Debt, Weighted Average Interest Rate	0.27%	0.29%	0.32%
Total short-term borrowings	$ 19,720	$ 20,255	$ 20,636