Allowance for Credit Losses on Loans - Summary of Performing and Nonperforming Loans by Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable Recorded Investment [Line Items]
Loans	$ 666,377	$ 592,071
Real Estate - Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	245,679	213,523
Other Real Estate Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	50,940	40,872
Real Estate 1 - 4 Family Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	27,789	12,481
Real Estate - Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	151,384	144,438
Home Equity [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	68,287	60,600
Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	6,408	6,214
Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	666,185	590,970
Performing [Member] | Real Estate - Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	245,679	213,035
Performing [Member] | Other Real Estate Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	50,940	40,872
Performing [Member] | Real Estate 1 - 4 Family Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	27,789	12,481
Performing [Member] | Real Estate - Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	151,320	144,160
Performing [Member] | Home Equity [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	68,247	60,419
Performing [Member] | Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	6,408	6,214
Non-Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	192	1,101
Non-Performing [Member] | Real Estate - Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans		488
Non-Performing [Member] | Real Estate - Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	64	278
Non-Performing [Member] | Home Equity [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	40	181
Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	104,870	102,362
Commercial [Member] | Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	104,782	102,208
Commercial [Member] | Non-Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	88	154
Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	11,020	11,581
Consumer Loans [Member] | Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 11,020	$ 11,581