Borrowed Funds (Long-term Borrowings) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Debt Disclosure [Abstract]
Long-term borrowings	$ 46,670	$ 45,755	$ 74,146
Basis spread on variable rate	0.50%
Average interest rate paid on long-term borrowings		4.32%	4.43%