Loans - Credit Quality (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Credit Quality Indicators
Value of commercial and SBA loan considered for risk review	$ 250,000
Total loans	502,943,000	$ 465,556,000
Commercial real estate
Credit Quality Indicators
Total loans	132,648,000	125,782,000
Commercial business
Credit Quality Indicators
Total loans	14,694,000	8,918,000
Commercial construction
Credit Quality Indicators
Total loans	8,360,000	4,729,000
SBA
Credit Quality Indicators
Total loans	39,754,000	39,217,000
Commercial loans
Credit Quality Indicators
Total loans	195,456,000	178,646,000
Commercial loans | Loans rated 1-5
Credit Quality Indicators
Total loans	183,572,000	170,203,000
Commercial loans | Loans rated 5.5
Credit Quality Indicators
Total loans	6,711,000	3,454,000
Commercial loans | Loans rated 6
Credit Quality Indicators
Total loans	2,608,000	1,325,000
Commercial loans | Loans rated 7
Credit Quality Indicators
Total loans	2,440,000	3,664,000
Commercial loans | Loans rated 8
Credit Quality Indicators
Total loans	125,000
Commercial loans | Commercial real estate
Credit Quality Indicators
Total loans	132,648,000	125,782,000
Commercial loans | Commercial real estate | Loans rated 1-5
Credit Quality Indicators
Total loans	125,789,000	122,466,000
Commercial loans | Commercial real estate | Loans rated 5.5
Credit Quality Indicators
Total loans	5,447,000	1,563,000
Commercial loans | Commercial real estate | Loans rated 6
Credit Quality Indicators
Total loans	789,000	75,000
Commercial loans | Commercial real estate | Loans rated 7
Credit Quality Indicators
Total loans	623,000	1,678,000
Commercial loans | Commercial business
Credit Quality Indicators
Total loans	14,694,000	8,918,000
Commercial loans | Commercial business | Loans rated 1-5
Credit Quality Indicators
Total loans	14,611,000	8,826,000
Commercial loans | Commercial business | Loans rated 5.5
Credit Quality Indicators
Total loans	83,000	92,000
Commercial loans | Commercial construction
Credit Quality Indicators
Total loans	8,360,000	4,729,000
Commercial loans | Commercial construction | Loans rated 1-5
Credit Quality Indicators
Total loans	8,360,000	4,729,000
Commercial loans | SBA
Credit Quality Indicators
Total loans	39,754,000	39,217,000
Commercial loans | SBA | Loans rated 1-5
Credit Quality Indicators
Total loans	34,812,000	34,182,000
Commercial loans | SBA | Loans rated 5.5
Credit Quality Indicators
Total loans	1,181,000	1,799,000
Commercial loans | SBA | Loans rated 6
Credit Quality Indicators
Total loans	1,819,000	1,250,000
Commercial loans | SBA | Loans rated 7
Credit Quality Indicators
Total loans	1,817,000	$ 1,986,000
Commercial loans | SBA | Loans rated 8
Credit Quality Indicators
Total loans	$ 125,000