Loans and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Credit Quality Indicators
Minimum outstanding balance of loans to be reviewed on a monthly basis	$ 25
Total loans	343,176	$ 330,782
Pass
Credit Quality Indicators
Total loans	338,383	320,467
Special Mention
Credit Quality Indicators
Total loans	756	5,753
Substandard
Credit Quality Indicators
Total loans	4,037	4,562
Commercial | Commercial
Credit Quality Indicators
Total loans	52,394	53,516
Commercial | Commercial | Pass
Credit Quality Indicators
Total loans	51,831	53,316
Commercial | Commercial | Substandard
Credit Quality Indicators
Total loans	563	200
Real estate | Residential Real Estate
Credit Quality Indicators
Total loans	79,202	79,680
Real estate | Residential Real Estate | Pass
Credit Quality Indicators
Total loans	78,855	79,033
Real estate | Residential Real Estate | Substandard
Credit Quality Indicators
Total loans	347	647
Construction | Commercial Real Estate
Credit Quality Indicators
Total loans	31,713	24,167
Construction | Commercial Real Estate | Pass
Credit Quality Indicators
Total loans	31,713	24,167
Auto | Consumer
Credit Quality Indicators
Total loans	1,286	1,425
Auto | Consumer | Pass
Credit Quality Indicators
Total loans	1,286	1,425
Other | Commercial Real Estate
Credit Quality Indicators
Total loans	175,746	169,290
Other | Commercial Real Estate | Pass
Credit Quality Indicators
Total loans	171,876	159,829
Other | Commercial Real Estate | Special Mention
Credit Quality Indicators
Total loans	756	5,753
Other | Commercial Real Estate | Substandard
Credit Quality Indicators
Total loans	3,114	3,708
Other | Consumer
Credit Quality Indicators
Total loans	2,835	2,704
Other | Consumer | Pass
Credit Quality Indicators
Total loans	2,822	2,697
Other | Consumer | Substandard
Credit Quality Indicators
Total loans	$ 13	$ 7