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Commitments and Contingencies - Summary of Financial Instrument Liabilities Represent Off-Balance Sheet Credit Risk (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Loss Contingencies [Line Items] |  |
Off-balance-sheet, credit risk | $ 172,525 | $ 156,384
Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Off-balance-sheet, credit risk | 50 | 50
Commitments To Originate Loans |  |
Loss Contingencies [Line Items] |  |
Off-balance-sheet, credit risk | 30,514 | 21,542
Commitment To Purchase Loans |  |
Loss Contingencies [Line Items] |  |
Off-balance-sheet, credit risk | 496 | 0
Unadvanced Funds On Lines Of Credit |  |
Loss Contingencies [Line Items] |  |
Off-balance-sheet, credit risk | 89,021 | 80,156
Unadvanced Funds on Construction Loans |  |
Loss Contingencies [Line Items] |  |
Off-balance-sheet, credit risk | $ 52,444 | $ 54,636

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