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Borrowed Funds (Summary of Short Term Borrowings) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Borrowed Funds [Abstract] |  |
Outstanding at end of period | $ 59,106 | $ 39,257
Weighted average interest rate at end of period | 0.07% | 0.34%
Maximum amount outstanding as of any month end | 59,106 | 52,367
Average amount outstanding | $ 46,478 | $ 38,812
Approximate weighted average rate during the period | 0.10% | 0.34%

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