v3.26.3
Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual $ 174,132 $ 91,584
Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual 21,904 16,092
Loans Held for Sale [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual 19,162  
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual 10,492 9,248
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual 78,616 30,586
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual 27,432 832
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual 51,184 29,754
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual 43,625 34,332
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual 333 1,326
Total Portfolio Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Nonaccrual $ 154,970 $ 91,584