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Loans Receivable - Summary of Nonaccrual Loans by Segment of Loan Portfolio (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable, Nonaccrual [Line Items] |  |
Total nonaccrual loans with a related allowance | $ 0 | $ 18,611
Total nonaccrual loans without a related allowance | 16,710 | 8,230
Commercial real estate [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Total nonaccrual loans with a related allowance | 0 | 18,502
Total nonaccrual loans without a related allowance | 15,285 | 6,939
Commercial and industrial [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Total nonaccrual loans with a related allowance | 0 | 109
Total nonaccrual loans without a related allowance | 1,285 | 1,178
Construction [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Total nonaccrual loans with a related allowance | 0 | 0
Total nonaccrual loans without a related allowance | 0 | 0
Residential first-lien mortgage [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Total nonaccrual loans with a related allowance | 0 | 0
Total nonaccrual loans without a related allowance | 140 | 94
Home equity/consumer [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Total nonaccrual loans with a related allowance | 0 | 0
Total nonaccrual loans without a related allowance | $ 0 | $ 19

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