v3.26.1
Loans and Allowance for Credit Losses - Summary of Loan Classes and Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans $ 41,149,726 $ 38,779,408
Nonaccrual Loans 127,526 144,666
30-89 Days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 51,784 81,511
Greater than 90 days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 13,715 18,403
Total Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 193,025 244,580
Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 40,956,701 38,534,828
Commercial and Industrial Portfolio [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 17,939,762 16,270,520
Nonaccrual Loans 33,917 26,633
Commercial and Industrial Portfolio [Member] | 30-89 Days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 15,797 36,391
Commercial and Industrial Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 179 6,417
Commercial and Industrial Portfolio [Member] | Total Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 49,893 69,441
Commercial and Industrial Portfolio [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 17,889,869 16,201,079
Specialty Lending Portfolio [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 657,710 518,237
Specialty Lending Portfolio [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 657,710 518,237
Commercial Real Estate Portfolio [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 16,567,363 16,376,239
Nonaccrual Loans 61,827 86,838
Commercial Real Estate Portfolio [Member] | 30-89 Days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 21,290 24,786
Commercial Real Estate Portfolio [Member] | Total Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 83,117 111,624
Commercial Real Estate Portfolio [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 16,484,246 16,264,615
Consumer Real Estate Portfolio [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 4,514,217 4,436,468
Nonaccrual Loans 30,561 29,910
Consumer Real Estate Portfolio [Member] | 30-89 Days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 5,209 10,451
Consumer Real Estate Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 399 244
Consumer Real Estate Portfolio [Member] | Total Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 36,169 40,605
Consumer Real Estate Portfolio [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 4,478,048 4,395,863
Consumer Portfolio [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 269,197 238,811
Nonaccrual Loans 177 777
Consumer Portfolio [Member] | 30-89 Days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 624 689
Consumer Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 5,238 5,237
Consumer Portfolio [Member] | Total Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 6,039 6,703
Consumer Portfolio [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 263,158 232,108
Credit Cards Portfolio [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 701,232 700,733
Nonaccrual Loans 1,044 508
Credit Cards Portfolio [Member] | 30-89 Days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 8,864 9,194
Credit Cards Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 7,899 6,505
Credit Cards Portfolio [Member] | Total Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 17,807 16,207
Credit Cards Portfolio [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 683,425 684,526
Leases and Other Portfolio [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 500,245 238,400
Leases and Other Portfolio [Member] | Current [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans $ 500,245 $ 238,400