Commitments and Contingencies - Summary Of Financial Instruments And Outstanding Amounts Represent Credit Risk (Detail) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Jun. 30, 2024 |
|---|---|---|
| Commitments to grant loans | ||
| Loan Commitments [Line Items] | ||
| Allowance for credit losses on off-balance sheet exposures | $ 585 | $ 775 |
| Unadvanced funds on equity lines of credit | ||
| Loan Commitments [Line Items] | ||
| Allowance for credit losses on off-balance sheet exposures | 3,698 | 4,107 |
| Unadvanced funds on commercial and other lines of credit | ||
| Loan Commitments [Line Items] | ||
| Allowance for credit losses on off-balance sheet exposures | $ 1,878 | $ 1,998 |