Loans - Loans Portfolio by Internal Risk Grading (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 1,057,959	$ 1,005,525	[1]
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	201,381	177,481
Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	527,615	503,154
Commercial real estate [Member] | Construction and land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	89,451	72,968
Commercial real estate [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	438,164	430,186
Commercial real estate [Member] | Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	438,164	430,186
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	323,864	318,883
Residential [Member] | Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	216,857	220,434
Residential [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	107,007	98,449
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,099	6,007
Consumer [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,061	5,999
Consumer [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	38	8
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	200,609	175,963
Pass [Member] | Commercial real estate [Member] | Construction and land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	86,580	68,853
Pass [Member] | Commercial real estate [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	426,666	418,719
Pass [Member] | Residential [Member] | Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	199,337	200,008
Pass [Member] | Residential [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	104,426	96,142
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	683	1,364
Special Mention [Member] | Commercial real estate [Member] | Construction and land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	818	1,210
Special Mention [Member] | Commercial real estate [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,811	5,860
Special Mention [Member] | Residential [Member] | Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	12,517	14,638
Special Mention [Member] | Residential [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,548	1,314
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	89	154
Substandard [Member] | Commercial real estate [Member] | Construction and land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,053	2,905
Substandard [Member] | Commercial real estate [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,687	5,607
Substandard [Member] | Residential [Member] | Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,003	5,788
Substandard [Member] | Residential [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,033	993
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Commercial real estate [Member] | Construction and land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Commercial real estate [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Residential [Member] | Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Residential [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0

[1] Derived from audited consolidated financial statements.