v3.26.3
Loans and the Allowance for Credit Losses - Summary of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans $ 19,900,551 $ 19,226,432
Loans held for sale 56,707 87,454
Total loans 19,957,258 19,313,886
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 3,067,867 2,863,893
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 11,319,515 10,938,834
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 1,637,322 1,783,637
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 9,682,193 9,155,197
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 3,998,944 3,938,585
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 273,414 355,726
Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans $ 1,240,811 $ 1,129,394