Loans and Allowance for Loan Losses (Details 5) - Consumer Loans [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	$ 402,187	$ 349,763
Real estate [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	215,588	174,802
Home equity [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	137,105	116,563
Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	31,922	43,318
Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	17,572	15,080
Pass [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	395,094	341,955
Pass [Member] | Real estate [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	211,563	172,589
Pass [Member] | Home equity [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	134,124	112,080
Pass [Member] | Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	31,922	42,319
Pass [Member] | Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	17,485	14,967
Special mention [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	3,189	4,394
Special mention [Member] | Real estate [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	1,064	961
Special mention [Member] | Home equity [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	2,109	3,388
Special mention [Member] | Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Special mention [Member] | Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	16	45
Substandard [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	3,904	3,414
Substandard [Member] | Real estate [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	2,961	1,252
Substandard [Member] | Home equity [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	872	1,095
Substandard [Member] | Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans		999
Substandard [Member] | Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans	71	68
Doubtful [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Doubtful [Member] | Real estate [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Doubtful [Member] | Home equity [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Doubtful [Member] | Construction [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
Loss [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Loss [Member] | Real estate [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Loss [Member] | Home equity [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Loss [Member] | Construction [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans
Loss [Member] | Other [Member]
Outstanding commercial and consumer loans by risk category
Outstanding consumer loans