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Short-Term Borrowings (Securities Sold Under Agreements To Repurchase) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Amount outstanding at end of year $ 333,909 $ 313,520
Securities Sold Under Agreements To Repurchase [Member]    
Short-term Debt [Line Items]    
Average daily balance during the year $ 17,001 $ 16,851
Average interest rate during the year 0.28% 0.27%
Maximum month-end balance during the year $ 21,239 $ 21,021
Amount outstanding at end of year $ 20,909 $ 19,720