Borrowed Funds (Long-term Borrowings) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Basis spread on variable rate	0.50%
Long-term borrowings	$ 45,751	$ 46,670
Average interest rate paid on long-term borrowings	4.33%	4.44%