Loans and Allowance for Loan Losses, Recorded Investment in Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Credit Quality Indicators [Abstract]
Loans	$ 533,016	$ 502,799
Pass [Member]
Credit Quality Indicators [Abstract]
Loans	508,088	469,634
Special Mention [Member]
Credit Quality Indicators [Abstract]
Loans	8,420	7,117
Substandard [Member]
Credit Quality Indicators [Abstract]
Loans	16,508	26,048
Doubtful [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Loss [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Commercial and Industrial [Member]
Credit Quality Indicators [Abstract]
Loans	28,352	24,413
Commercial and Industrial [Member] | Pass [Member]
Credit Quality Indicators [Abstract]
Loans	26,431	21,769
Commercial and Industrial [Member] | Special Mention [Member]
Credit Quality Indicators [Abstract]
Loans	964	1,152
Commercial and Industrial [Member] | Substandard [Member]
Credit Quality Indicators [Abstract]
Loans	957	1,492
Commercial and Industrial [Member] | Doubtful [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Commercial and Industrial [Member] | Loss [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Commercial Real Estate [Member]
Credit Quality Indicators [Abstract]
Loans	184,532	176,827
Commercial Real Estate [Member] | Pass [Member]
Credit Quality Indicators [Abstract]
Loans	175,942	167,625
Commercial Real Estate [Member] | Special Mention [Member]
Credit Quality Indicators [Abstract]
Loans	3,632	4,243
Commercial Real Estate [Member] | Substandard [Member]
Credit Quality Indicators [Abstract]
Loans	4,958	4,959
Commercial Real Estate [Member] | Doubtful [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Commercial Real Estate [Member] | Loss [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Construction and Land [Member]
Credit Quality Indicators [Abstract]
Loans	64,278	54,162
Construction and Land [Member] | Pass [Member]
Credit Quality Indicators [Abstract]
Loans	60,318	44,006
Construction and Land [Member] | Special Mention [Member]
Credit Quality Indicators [Abstract]
Loans	2,325	143
Construction and Land [Member] | Substandard [Member]
Credit Quality Indicators [Abstract]
Loans	1,635	10,013
Construction and Land [Member] | Doubtful [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Construction and Land [Member] | Loss [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Consumer [Member]
Credit Quality Indicators [Abstract]
Loans	5,144	5,068
Consumer [Member] | Pass [Member]
Credit Quality Indicators [Abstract]
Loans	5,141	5,065
Consumer [Member] | Special Mention [Member]
Credit Quality Indicators [Abstract]
Loans	3	3
Consumer [Member] | Substandard [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Consumer [Member] | Doubtful [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Consumer [Member] | Loss [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Student [Member]
Credit Quality Indicators [Abstract]
Loans	9,448	10,677
Student [Member] | Pass [Member]
Credit Quality Indicators [Abstract]
Loans	9,448	10,677
Student [Member] | Special Mention [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Student [Member] | Substandard [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Student [Member] | Doubtful [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Student [Member] | Loss [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Residential Real Estate [Member]
Credit Quality Indicators [Abstract]
Loans	199,149	187,104
Residential Real Estate [Member] | Pass [Member]
Credit Quality Indicators [Abstract]
Loans	191,992	180,119
Residential Real Estate [Member] | Special Mention [Member]
Credit Quality Indicators [Abstract]
Loans	1,071	763
Residential Real Estate [Member] | Substandard [Member]
Credit Quality Indicators [Abstract]
Loans	6,086	6,222
Residential Real Estate [Member] | Doubtful [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Residential Real Estate [Member] | Loss [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Home Equity Lines of Credit [Member]
Credit Quality Indicators [Abstract]
Loans	42,113	44,548
Home Equity Lines of Credit [Member] | Pass [Member]
Credit Quality Indicators [Abstract]
Loans	38,816	40,373
Home Equity Lines of Credit [Member] | Special Mention [Member]
Credit Quality Indicators [Abstract]
Loans	425	813
Home Equity Lines of Credit [Member] | Substandard [Member]
Credit Quality Indicators [Abstract]
Loans	2,872	3,362
Home Equity Lines of Credit [Member] | Doubtful [Member]
Credit Quality Indicators [Abstract]
Loans	0	0
Home Equity Lines of Credit [Member] | Loss [Member]
Credit Quality Indicators [Abstract]
Loans	$ 0	$ 0