Other Borrowings (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Other Borrowings [Abstract]
Federal Home Loan Bank, Maximum Term Of Commitment	364 days
Maximum borrowing capacity with the FHLB	$ 314.6
Amount available to borrow at year-end	314.6
Unsecured line of credit	6.0
Available through federal reserve discount window	$ 20.0