Loans and the Allowance for Loan Losses (Loan Portfolio by Risk Rating) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans and the Allowance for Loan Losses [Line Items]
Total loans	$ 1,978,909	$ 1,049,698
Unearned income	(3,128)	(2,382)
Pass [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	1,968,892	1,020,905
Special Mention [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	8,792	6,989
Substandard [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	4,353	24,186
Doubtful [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Loss [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Commercial real estate - owner occupied [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	467,082	250,440
Unearned income	(779)	(581)
Commercial real estate - owner occupied [Member] | Pass [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	465,464	247,001
Commercial real estate - owner occupied [Member] | Special Mention [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	1,639	1,213
Commercial real estate - owner occupied [Member] | Substandard [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	758	2,807
Commercial real estate - owner occupied [Member] | Doubtful [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Commercial real estate - owner occupied [Member] | Loss [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Commercial real estate - non-owner occupied [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	436,083	184,688
Unearned income	(1,004)	(632)
Commercial real estate - non-owner occupied [Member] | Pass [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	437,087	185,020
Commercial real estate - non-owner occupied [Member] | Special Mention [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	300
Commercial real estate - non-owner occupied [Member] | Substandard [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Commercial real estate - non-owner occupied [Member] | Doubtful [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Commercial real estate - non-owner occupied [Member] | Loss [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Residential real estate [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	489,669	204,413
Unearned income	(155)	(159)
Residential real estate [Member] | Pass [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	487,800	202,762
Residential real estate [Member] | Special Mention [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	189	932
Residential real estate [Member] | Substandard [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	1,835	878
Residential real estate [Member] | Doubtful [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Residential real estate [Member] | Loss [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Commercial [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	463,652	311,486
Unearned income	(804)	(597)
Commercial [Member] | Pass [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	461,091	287,978
Commercial [Member] | Special Mention [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	1,615	4,544
Commercial [Member] | Substandard [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	1,750	19,561
Commercial [Member] | Doubtful [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Commercial [Member] | Loss [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Real estate construction [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	97,481	91,822
Unearned income	(390)	(414)
Real estate construction [Member] | Pass [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	92,522	91,296
Real estate construction [Member] | Special Mention [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	5,349	0
Real estate construction [Member] | Substandard [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	940
Real estate construction [Member] | Doubtful [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Real estate construction [Member] | Loss [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Consumer [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	24,942	6,849
Unearned income	4	1
Consumer [Member] | Pass [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	24,928	6,848
Consumer [Member] | Special Mention [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Consumer [Member] | Substandard [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	10	0
Consumer [Member] | Doubtful [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	0	0
Consumer [Member] | Loss [Member]
Loans and the Allowance for Loan Losses [Line Items]
Total loans	$ 0	$ 0