Loans and Allowance for Loan Losses (Details 4) - Consumer loans [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	$ 536,152	$ 480,117
Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	23,212	22,575
Pass [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	527,054	472,685
Pass [Member] | Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	22,999	22,367
Special Mention [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	2,568	1,828
Special Mention [Member] | Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	156	88
Substandard [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	6,530	5,604
Substandard [Member] | Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	57	120
Doubtful [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Doubtful [Member] | Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Real estate [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	311,271	273,050
Real estate [Member] | Pass [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	305,496	269,422
Real estate [Member] | Special Mention [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	1,886	715
Real estate [Member] | Substandard [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	3,889	2,913
Real estate [Member] | Doubtful [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Home equity [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	163,654	156,141
Home equity [Member] | Pass [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	160,544	152,545
Home equity [Member] | Special Mention [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	526	1,025
Home equity [Member] | Substandard [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	2,584	2,571
Home equity [Member] | Doubtful [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	38,015	28,351
Construction [Member] | Pass [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	38,015	28,351
Construction [Member] | Special Mention [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Construction [Member] | Substandard [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Construction [Member] | Doubtful [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans