Loans - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loan	$ 2,555,552	$ 2,536,043
Asset Pledged as Collateral without Right [Member] | HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loan	12,000	11,900
Asset Pledged as Collateral without Right [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loan	333,200	369,500
Asset Pledged as Collateral without Right [Member] | Multi-family Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loan	49,000	47,700
Asset Pledged as Collateral without Right [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential mortgage loan	$ 188,100	$ 190,100