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Loans Receivable - Summary of Aggregate Pass and Classified Rating of Segments of Loan Portfolio (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | $ 1,500,811 | $ 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 | 1,080,288 | 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 | 52,157 | 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 | 320,824 | 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 | 39,682 | 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 | $ 7,860 | 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

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