Quarterly report [Sections 13 or 15(d)]

Loans - Loans (Detail) (Parenthetical)

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Loans - Loans (Detail) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans receivable $ 6,568,701 $ 6,563,368
Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans receivable 5,057,488 5,079,977
Real Estate | Home Equity Loans and Lines - Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans receivable 700 1,000
Real Estate | Personal Loans - Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans receivable $ 5,000 $ 3,800