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Borrowed Funds (Summary of Short Term Borrowings) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Outstanding at end of period | $ 29,554 | $ 35,828
Weighted average interest rate | 0.17% | 0.16%
Maximum amount outstanding as of any month end | $ 29,554 | $ 47,131
Average amount outstanding | $ 30,426 | $ 35,908
Securities Sold under Agreements to Repurchase [Member] |  |
Weighted average interest rate | 0.17% | 0.16%

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