Loans - Summary of Loans by Credit Quality Indicator (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 638,860	$ 551,133
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	386,485	304,382
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,624	26,690
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	31,525	20,599
Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	206,226	199,462
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	215,139	137,114
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	192,349	110,731
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,601	15,040
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	15,408	10,295
Commercial [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,781	1,048
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	198,948	196,748
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	171,443	174,045
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	9,930	11,546
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	15,547	9,994
Commercial Real Estate [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,028	1,163
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	177,799	174,259
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	180	183
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	21	237
Residential Real Estate [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	177,598	173,839
Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	28,123	23,960
Construction & Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	22,513	19,423
Construction & Land Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	93	104
Construction & Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	478
Construction & Land Development [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,039	4,433
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	18,851	19,052
Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	71	73
Consumer [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 18,780	$ 18,979