Loans - Loans (Detail) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	$ 6,020,785	$ 5,967,133
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	4,699,341	4,567,853
Real Estate | Home Equity Loans and Lines - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	2,000	2,400
Real Estate | Personal Loans - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans receivable	$ 4,200	$ 4,600