Loans Held for Investment - Composition of Net Loans Held for Investment by Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Total	$ 635,928	$ 591,207
Less:
Less allowance for credit losses on loans	(5,908)	(5,561)
Deferred loan costs (fees) net	810	864
Net loans held for investment	630,830	586,510
Commercial [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Total	102,616	102,366
Commercial [Member] | Real Estate - Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Total	235,897	213,397
Commercial [Member] | Other Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Total	44,032	40,872
Commercial [Member] | Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Total	5,971	6,214
Non-Commercial [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Total	11,268	11,581
Non-Commercial [Member] | Real Estate 1 - 4 Family Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Total	18,987	12,481
Non-Commercial [Member] | Real Estate - Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Total	152,813	143,697
Non-Commercial [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, Total	$ 64,344	$ 60,599