Loans - Summary of Classes of Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 692,866	$ 620,405	$ 607,327
Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	670,521	599,834
Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	14,397	14,296
Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	6,237	4,190
Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,711	2,085
Residential Mortgage Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	243,388	239,644
Residential Mortgage Loans [Member] | 1-4 Family First Lien Residential Mortgages [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	239,422	232,523	225,864
Residential Mortgage Loans [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,966	7,121
Residential Mortgage Loans [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	239,845	235,684
Residential Mortgage Loans [Member] | Pass [Member] | 1-4 Family First Lien Residential Mortgages [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	235,879	228,563
Residential Mortgage Loans [Member] | Pass [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,966	7,121
Residential Mortgage Loans [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	986	999
Residential Mortgage Loans [Member] | Special Mention [Member] | 1-4 Family First Lien Residential Mortgages [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	986	999
Residential Mortgage Loans [Member] | Special Mention [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Residential Mortgage Loans [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,318	1,190
Residential Mortgage Loans [Member] | Substandard [Member] | 1-4 Family First Lien Residential Mortgages [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,318	1,190
Residential Mortgage Loans [Member] | Substandard [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Residential Mortgage Loans [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,239	1,771
Residential Mortgage Loans [Member] | Doubtful [Member] | 1-4 Family First Lien Residential Mortgages [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,239	1,771
Residential Mortgage Loans [Member] | Doubtful [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	370,756	329,228
Commercial Loans [Member] | Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	225,794	212,314	206,960
Commercial Loans [Member] | Lines of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	56,569	44,235	49,314
Commercial Loans [Member] | Other Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	79,590	63,359	58,742
Commercial Loans [Member] | Tax Exempt Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	8,803	9,320	9,860
Commercial Loans [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	352,902	313,150
Commercial Loans [Member] | Pass [Member] | Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	214,631	201,997
Commercial Loans [Member] | Pass [Member] | Lines of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	54,813	42,489
Commercial Loans [Member] | Pass [Member] | Other Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	74,655	59,344
Commercial Loans [Member] | Pass [Member] | Tax Exempt Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	8,803	9,320
Commercial Loans [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	13,158	13,058
Commercial Loans [Member] | Special Mention [Member] | Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	7,994	8,299
Commercial Loans [Member] | Special Mention [Member] | Lines of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,349	1,491
Commercial Loans [Member] | Special Mention [Member] | Other Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,815	3,268
Commercial Loans [Member] | Special Mention [Member] | Tax Exempt Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Commercial Loans [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	4,336	2,792
Commercial Loans [Member] | Substandard [Member] | Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,864	1,947
Commercial Loans [Member] | Substandard [Member] | Lines of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	407	233
Commercial Loans [Member] | Substandard [Member] | Other Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,065	612
Commercial Loans [Member] | Substandard [Member] | Tax Exempt Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Commercial Loans [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	360	228
Commercial Loans [Member] | Doubtful [Member] | Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	305	71
Commercial Loans [Member] | Doubtful [Member] | Lines of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	22
Commercial Loans [Member] | Doubtful [Member] | Other Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	55	135
Commercial Loans [Member] | Doubtful [Member] | Tax Exempt Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	0	0
Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	78,722	51,533
Consumer Loans [Member] | Home Equity and Junior Liens [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	26,214	26,109	26,262
Consumer Loans [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	52,508	25,424	$ 27,037
Consumer Loans [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	77,774	51,000
Consumer Loans [Member] | Pass [Member] | Home Equity and Junior Liens [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	25,557	25,706
Consumer Loans [Member] | Pass [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	52,217	25,294
Consumer Loans [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	253	239
Consumer Loans [Member] | Special Mention [Member] | Home Equity and Junior Liens [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	111	144
Consumer Loans [Member] | Special Mention [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	142	95
Consumer Loans [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	583	208
Consumer Loans [Member] | Substandard [Member] | Home Equity and Junior Liens [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	434	173
Consumer Loans [Member] | Substandard [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	149	35
Consumer Loans [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	112	86
Consumer Loans [Member] | Doubtful [Member] | Home Equity and Junior Liens [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	112	86
Consumer Loans [Member] | Doubtful [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 0	$ 0