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Fair Value of Assets and Liabilities (Additional) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Allowance for credit losses $ 39,074 $ 39,776 $ 37,423 $ 35,609 $ 34,690 $ 35,066
Collateral Pledged            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Allowance for credit losses $ 4,400   $ 3,900