Loans and Allowance (Troubled Debts Restructured Defaulted) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan
Commercial Segment [Member]
Financing Receivable, Modifications [Line Items]
No. of Loans | loan			1
Post-Modification Outstanding Recorded Balance | $			$ 820
Consumer [Member] | First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
No. of Loans | loan	1	5
Post-Modification Outstanding Recorded Balance | $	$ 79	$ 179
Consumer [Member] | Boat/RVs [Member]
Financing Receivable, Modifications [Line Items]
No. of Loans | loan		1
Post-Modification Outstanding Recorded Balance | $		$ 7