Borrowed Funds (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) entity	Dec. 31, 2015 USD ($)
Federal funds purchase line available under repurchase agreements	$ 60.0
Number of Entities with Repurchase Agreement Lines Available | entity	3
Repurchase Agreement transaction period	one-to-four day
Loans pledged under FHLB agreement	$ 577.7	$ 447.9
Investment Securities Pledged Under FHLB Agreement	0.0	0.0
Collateral Pledged For Repurchase Agreements	61.5	$ 58.9
First Year of Scheduled FHLB Principal Payments	138.0
Line of Credit Facility, Maximum Borrowing Capacity	106.7
Bank SNB [Member]
Federal Home Loan Bank Advances	$ 138.0