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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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