Loans and Allowance (Troubled Debts Restructured) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) loan	Mar. 31, 2017 USD ($) loan
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
No. of Loans | loan	3
Pre-Modification Outstanding Recorded Balance	$ 138
Post-Modification Outstanding Recorded Balance	$ 140
Commercial Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
No. of Loans | loan	1	1
Pre-Modification Outstanding Recorded Balance	$ 61	$ 72
Post-Modification Outstanding Recorded Balance	$ 61	$ 72
Consumer [Member] | First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
No. of Loans | loan	3	1
Pre-Modification Outstanding Recorded Balance	$ 47	$ 65
Post-Modification Outstanding Recorded Balance	$ 59	$ 67
Consumer [Member] | Second Mortgage [Member]
Financing Receivable, Modifications [Line Items]
No. of Loans | loan	1
Pre-Modification Outstanding Recorded Balance	$ 36
Post-Modification Outstanding Recorded Balance	$ 36