Loans and the Allowance for Loan Losses (Recorded Investment for Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans and the Allowance for Loan Losses [Line Items]
Average recorded investment in impaired loans	$ 5,572	$ 8,172	$ 7,738
Commercial real estate - owner occupied [Member]
Loans and the Allowance for Loan Losses [Line Items]
Average recorded investment in impaired loans	1,075	59	0
Commercial real estate - non-owner occupied [Member]
Loans and the Allowance for Loan Losses [Line Items]
Average recorded investment in impaired loans	0	2,099	5,572
Residential Real Estate [Member]
Loans and the Allowance for Loan Losses [Line Items]
Average recorded investment in impaired loans	0	120	163
Commercial [Member]
Loans and the Allowance for Loan Losses [Line Items]
Average recorded investment in impaired loans	3,395	4,885	917
Real Estate Construction [Member]
Loans and the Allowance for Loan Losses [Line Items]
Average recorded investment in impaired loans	923	1,009	1,086
Consumer [Member]
Loans and the Allowance for Loan Losses [Line Items]
Average recorded investment in impaired loans	$ 179	$ 0	$ 0