Loans Receivable - Summary of Aggregate Pass and Classified Rating of Segments of Loan Portfolio (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 1,500,864	$ 1,372,824
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		1,362,973
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		3,392
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		6,459
Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial real estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,022,954	873,573
Commercial real estate [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		864,497
Commercial real estate [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		2,883
Commercial real estate [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		6,193
Commercial real estate [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial and industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	46,022	28,859
Commercial and industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		28,350
Commercial and industrial [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		509
Commercial and industrial [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Commercial and industrial [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	383,615	417,538
Construction [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		417,390
Construction [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Construction [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		148
Construction [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Residential first-lien mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	40,244	43,125
Residential first-lien mortgage [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		43,007
Residential first-lien mortgage [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Residential first-lien mortgage [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		118
Residential first-lien mortgage [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Home equity/consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 8,029	9,729
Home equity/consumer [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		9,729
Home equity/consumer [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Home equity/consumer [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		0
Home equity/consumer [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		$ 0