Borrowed Funds (Summary of Short Term Borrowings) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Borrowed Funds [Abstract]
Outstanding at end of period	$ 38,460	$ 39,801
Weighted average interest rate at end of period	0.15%	0.15%
Maximum amount outstanding as of any month end	$ 47,131	$ 53,819
Average amount outstanding	$ 33,506	$ 45,702
Approximate weighted average rate during the period	0.12%	0.13%