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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
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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- Definition

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