Borrowed Funds (Long-term Borrowings) (Narrative) (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) institiution	Sep. 30, 2014 USD ($) institiution	Dec. 31, 2014 USD ($) institiution	Dec. 31, 2008
Debt Disclosure [Abstract]
Long-term borrowings	$ 76,059	$ 78,466	$ 77,490
Number of unaffiliated institutions | institiution	2	2	2
Basis spread on variable rate	0.50%			2.75%
Average interest rate paid on long-term borrowings	4.37%	4.10%