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Borrowed Funds (Summary of Short Term Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Borrowed Funds [Abstract]    
Short-term Borrowings $ 43,617 $ 43,676
Weighted average interest rate at end of period 0.13% 0.14%
Maximum amount outstanding as of any month end 48,195 61,354
Average amount outstanding $ 43,307 $ 47,777
Approximate weighted average rate during the period 0.13% 0.13%