Loans Held for Investment - Composition of Net Loans Held for Investment by Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans, Total	$ 665,552	$ 591,207
Less:
Less: allowance for credit losses on loans	(5,824)	(5,561)
Deferred loan fees, net	825	864
Net loans held for investment	660,553	586,510
Commercial [Member] | Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, Total	104,872	102,366
Commercial [Member] | Real Estate - Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, Total	245,569	213,397
Commercial [Member] | Other Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, Total	50,940	40,872
Commercial [Member] | Other Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, Total	6,408	6,214
Non-Commercial [Member] | Consumer Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, Total	11,020	11,581
Non-Commercial [Member] | Real Estate 1 - 4 Family Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, Total	27,789	12,481
Non-Commercial [Member] | Real Estate - Residential [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, Total	150,667	143,697
Non-Commercial [Member] | Home Equity [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans, Total	$ 68,287	$ 60,599