Borrowed Funds (Summary of Short Term Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Outstanding at end of period	$ 35,269	$ 36,000
Weighted average interest rate	0.18%	0.16%
Maximum amount outstanding as of any month end	$ 35,269	$ 39,456
Average amount outstanding	$ 32,628	$ 30,899
Securities Sold under Agreements to Repurchase [Member]
Weighted average interest rate	0.20%	0.19%