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Borrowed Funds (Summary of Short Term Borrowings) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Outstanding at end of period | $ 35,269 | $ 36,000
Weighted average interest rate | 0.18% | 0.16%
Maximum amount outstanding as of any month end | $ 35,269 | $ 39,456
Average amount outstanding | $ 32,628 | $ 30,899
Securities Sold under Agreements to Repurchase [Member] |  |
Weighted average interest rate | 0.20% | 0.19%

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