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Short-Term Borrowings (Short-Term Federal Home Loan Bank Borrowings) (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
Federal Home Loan Bank Advances [Member]    
Short-term Debt [Line Items]    
Average daily balance during the year 295,479 287,778
Maximum month-end balance during the year 342,000 363,900
Amount outstanding at end of year $ 313,000 $ 293,800