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Premises and Equipment, Net and Other Assets - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Abstract]      
Noncash construction in progress for retainage payable $ 195,000 $ 195,000  
Cash surrender value of life insurance policies $ 84,400,000 84,400,000  
Percentage of equity investment 50.00%    
Low income housing tax credit investments $ 58,600,000 $ 46,400,000  
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] Interest Receivable and Other Assets Interest Receivable and Other Assets  
Tax credits and other tax benefits recognized from LIHTC investments $ 7,400,000 $ 7,300,000 $ 6,400,000
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit)
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit)
Equity securities $ 13,400,000 $ 13,100,000  
Amortization expense resulting from LIHTC investments $ 6,000,000 $ 5,600,000 $ 5,100,000
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit)
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit)
Unfunded commitment on investments $ 34,500,000    
Percentage of qualified investment 39.00%    
Period of qualified investments taken 7 years    
New market tax credit investments $ 7,500,000 $ 12,100,000  
Tax credits and other tax benefits recognized from NMTC investments 5,600,000 5,600,000 $ 4,700,000
Amortization expense resulting from NMTC investments 4,600,000 4,600,000 3,900,000
Unfunded commitment on NMTC investments 0    
Historic tax credit investments 6,300,000 0  
Tax credits and other tax benefits recognized from HTC investments 0 0 0
Amortization expense resulting from HTC investments 0 $ 0 $ 0
Unfunded commitment on HTC investments $ 5,100,000