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Loans - Loans (Detail) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	$ 6,257,744	$ 6,182,434
Payment Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	100	200
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	4,871,373	4,852,400
Real Estate | Home Equity Loans and Lines - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	1,500	1,900
Real Estate | Personal Loans - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	$ 6,800	$ 4,500

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