v3.26.1
Loans and the Allowance for Credit Losses - Schedule of Recorded Investment in Loans by Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans $ 19,478,966 $ 19,226,432
Loans held for sale 57,318 87,454
Total loans 19,536,284 19,313,886
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 2,949,863 2,863,893
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 11,093,370 10,938,834
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 1,505,492 1,783,637
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 9,587,878 9,155,197
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 3,939,813 3,938,585
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans 304,111 355,726
Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total portfolio loans $ 1,191,809 $ 1,129,394