v3.26.1
Qualified Affordable Housing Project Investments - Schedule of Investments in Qualified Affordable Housing Projects along with the Related Expenses and Tax Credits Recognized (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Equity Method Investments and Joint Ventures [Abstract]          
Low-income-housing tax credit investments $ 4,000   $ 4,000   $ 4,000
Unfunded commitments (335)   (335)   (418)
Net funded low-income-housing tax credit investments 3,665   3,665   $ 3,582
Amortization expense $ 112 $ 112 $ 224 $ 224  
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] Noninterest Expense Noninterest Expense Noninterest Expense Noninterest Expense  
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Expense Noninterest Expense Noninterest Expense Noninterest Expense  
Tax credits recognized $ 112 $ 111 $ 224 $ 223  
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] Income Tax Expense (Benefit) 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 Income or Comprehensive Income [Extensible Enumeration] Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit)