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Short-Term Borrowings (Summary Of Short-Term Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Short-term borrowings, Total Principal $ 394,480 $ 333,909
Federal Home Loan Bank Advances [Member]    
Short-term Debt [Line Items]    
Short-term borrowings, Total Principal $ 372,700 $ 313,000
Short-term borrowings, Weighted Average Rate 0.97% 0.54%
Securities Sold Under Agreements To Repurchase [Member]    
Short-term Debt [Line Items]    
Short-term borrowings, Total Principal $ 21,780 $ 20,909
Short-term borrowings, Weighted Average Rate 0.29% 0.28%