Loans and the Allowance for Loan Losses (Troubled Debt Restructuring) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	5	6
Outstanding balance	$ 2,085	$ 4,178
Recorded investment	$ 2,043	$ 4,082
Performing [Member] | Commercial real estate - owner occupied [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	0	0
Outstanding balance	$ 0	$ 0
Recorded investment	$ 0	$ 0
Performing [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	0	0
Outstanding balance	$ 0	$ 0
Recorded investment	$ 0	$ 0
Performing [Member] | Residential real estate [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	1	1
Outstanding balance	$ 208	$ 217
Recorded investment	$ 166	$ 175
Performing [Member] | Commercial [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	2	2
Outstanding balance	$ 921	$ 967
Recorded investment	$ 921	$ 967
Performing [Member] | Real estate construction [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	0	0
Outstanding balance	$ 0	$ 0
Recorded investment	$ 0	$ 0
Performing [Member] | Consumer [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	0	0
Outstanding balance	$ 0	$ 0
Recorded investment	$ 0	$ 0
Non-Performing [Member] | Commercial real estate - owner occupied [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	0	0
Outstanding balance	$ 0	$ 0
Recorded investment	$ 0	$ 0
Non-Performing [Member] | Commercial Real Estate Non-Owner Occupied [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	0	0
Outstanding balance	$ 0	$ 0
Recorded investment	$ 0	$ 0
Non-Performing [Member] | Residential real estate [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	0	0
Outstanding balance	$ 0	$ 0
Recorded investment	$ 0	$ 0
Non-Performing [Member] | Commercial [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	2	2
Outstanding balance	$ 956	$ 2,000
Recorded investment	$ 956	$ 2,000
Non-Performing [Member] | Real estate construction [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	0	1
Outstanding balance	$ 0	$ 994
Recorded investment	$ 0	$ 940
Non-Performing [Member] | Consumer [Member]
Loans and the Allowance for Loan Losses [Line Items]
Number of loans | loan	0	0
Outstanding balance	$ 0	$ 0
Recorded investment	$ 0	$ 0