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Borrowed Funds (Summary of Short Term Borrowings) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Short-term Debt [Line Items]    
Outstanding at end of year $ 36,000 $ 35,828
Weighted average interest rate at year end 0.16% 0.16%
Maximum amount outstanding as of any month end $ 39,456 $ 47,131
Average amount outstanding $ 30,899 $ 35,908
Securities Sold under Agreements to Repurchase [Member]    
Short-term Debt [Line Items]    
Approximate weighted average rate during the period 0.19% 0.16%