Loans - Summary of Loans by Credit Quality Indicator (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 553,254	$ 609,870
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	333,864	368,067
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,739	4,897
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	20,119	31,675
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans		317
Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	197,532	204,914
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	146,138	191,540
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	140,233	177,620
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	489	2,352
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,174	9,644
Commercial [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,242	1,924
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	184,677	187,221
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	166,796	161,091
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,250	2,545
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	15,482	21,812
Commercial Real Estate [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,149	1,773
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	171,496	177,155
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	168	174
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	121	114
Residential Real Estate [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	171,207	176,867
Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	34,393	36,038
Construction & Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	26,667	29,182
Construction & Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	329
Construction & Land Development [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans		317
Construction & Land Development [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,397	6,539
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	16,550	17,916
Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	13	105
Consumer [Member] | Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 16,537	$ 17,811