Loans - Loans Portfolio by Internal Risk Grading (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 980,984	$ 840,925	[1]
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	164,025	126,981
Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	68,692	50,863
Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	424,404	391,472
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	219,415	175,293
Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	98,249	91,075
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,199	5,241
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans		125,405
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	162,525
Pass [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	63,538	45,534
Pass [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	411,483	382,607
Pass [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	198,067	165,367
Pass [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	95,351	88,646
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans		1,569
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,362
Special Mention [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,579	569
Special Mention [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,179	4,889
Special Mention [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	16,268	6,709
Special Mention [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,528	1,801
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans		7
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	138
Substandard [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,575	4,760
Substandard [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,742	3,976
Substandard [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,080	3,217
Substandard [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,370	628
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans		0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0
Doubtful [Member] | Commercial Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful [Member] | Home equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,148	5,240
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 51	$ 1

[1] Derived from audited consolidated financial statements.