Loans Receivable - Summary of Nonaccrual Loans by Segment of Loan Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans	$ 266	$ 1,175
Commercial real estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans	0	766
Commercial and industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans	0	0
Construction [Member]
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans	148	278
Residential first-lien mortgage [Member]
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans	$ 118	$ 131