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Business Combination & Asset Purchase - Summary of Consideration Paid and Amounts of Assets Acquired and Liabilities Assumed Recognized (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Assets |  |  |  |
Goodwill |  | $ 86,358 | $ 86,358 |
Peoples Federal Savings and Loan [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash | $ 9,806 | $ 0 | $ 0 | $ 9,806
Common Shares | 13,446 |  |  |
Treasury stock repurchased | (3) |  |  |
Total | 23,249 |  |  |
Assets |  |  |  |
Cash and cash equivalents | 18,881 |  |  |
Other securities, at cost | 1,271 |  |  |
Loans, net | 101,755 |  |  |
Premises and equipment | 1,906 |  |  |
Goodwill | 5,924 |  |  |
Other assets | 12,081 |  |  |
Total Assets Purchased | 141,818 |  |  |
Deposits |  |  |  |
Noninterest bearing | 7,139 |  |  |
Interest bearing | 104,719 |  |  |
Total deposits | 111,858 |  |  |
Federal Home Loan Bank (FHLB) advances | 896 |  |  |
Accrued expenses and other liabilities | 5,815 |  |  |
Total Liabilities Assumed | $ 118,569 |  |  |

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