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Loans - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Residential mortgage loan |  |  | $ 659 | $ 732
Loans | $ 2,531,496 |  | 2,357,903 |
Allowance for loan losses | 25,277 | $ 24,910 | 20,313 |
HELOC [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 250,891 |  | 242,360 |
Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Residential mortgage loan |  |  | 14 | $ 18
Loans | 1,304,118 |  | 1,152,603 |
Allowance for loan losses | 16,805 | $ 16,681 | 11,924 |
Asset Pledged as Collateral without Right [Member] | HELOC [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Residential mortgage loan | 11,200 |  | 10,400 |
Asset Pledged as Collateral without Right [Member] | Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Residential mortgage loan | 161,200 |  |  |
Asset Pledged as Collateral without Right [Member] | Residential Mortgage [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Residential mortgage loan | $ 213,000 |  | $ 222,500 |

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