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Short-Term Borrowings (Securities Sold Under Agreements To Repurchase) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Amount outstanding at end of year $ 394,480 $ 333,909
Securities Sold Under Agreements To Repurchase [Member]    
Short-term Debt [Line Items]    
Average daily balance during the year $ 17,529 $ 17,001
Average interest rate during the year 0.29% 0.28%
Maximum month-end balance during the year $ 21,780 $ 21,239
Amount outstanding at end of year $ 21,780 $ 20,909