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Borrowed Funds (Summary of Short Term Borrowings) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Outstanding at end of period | $ 55,210 | $ 48,845
Short-term FHLB Advance [Member] |  |
Overnight borrowings | 9,000 | 0
Securities Sold under Agreements to Repurchase [Member] |  |
Outstanding at end of period | $ 46,210 | $ 48,845
Weighted average interest rate | 0.04% | 0.15%
Maximum amount outstanding as of any month end | $ 46,210 | $ 58,438
Average amount outstanding | $ 45,879 | $ 37,326
Approximate weighted average rate during the period | 0.04% | 0.19%

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