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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%