v3.26.1
Loans and allowance for loan losses - Effect of Loan Modification on Weighted-average Remaining Life (Detail)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Commercial and industrial    
Financing Receivable, Modifications [Line Items]    
Weighted-average remaining term 2 years 9 months 18 days
Commercial Real Estate    
Financing Receivable, Modifications [Line Items]    
Weighted-average remaining term 1 year 9 months 18 days
Residential Real Estate    
Financing Receivable, Modifications [Line Items]    
Weighted-average remaining term 11 years 2 months 12 days 9 years