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Loans and Allowance for Credit Losses - Summary of Loan Classes and Aging of Past Due Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 40,134,325 | $ 38,779,408
Nonaccrual Loans | 151,250 | 144,666
30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 40,260 | 81,511
Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 14,924 | 18,403
Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 206,434 | 244,580
Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 39,927,891 | 38,534,828
Commercial and Industrial Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 17,068,764 | 16,270,520
Nonaccrual Loans | 55,975 | 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 | 8,811 | 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 | 1 | 6,417
Commercial and Industrial Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 64,787 | 69,441
Commercial and Industrial Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 17,003,977 | 16,201,079
Specialty Lending Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 646,027 | 518,237
Specialty Lending Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 646,027 | 518,237
Commercial Real Estate Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 16,627,070 | 16,376,239
Nonaccrual Loans | 63,436 | 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 | 8,647 | 24,786
Commercial Real Estate Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 959 |
Commercial Real Estate Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 73,042 | 111,624
Commercial Real Estate Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 16,554,028 | 16,264,615
Consumer Real Estate Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,429,728 | 4,436,468
Nonaccrual Loans | 31,103 | 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 | 11,631 | 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 |  | 244
Consumer Real Estate Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 42,734 | 40,605
Consumer Real Estate Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,386,994 | 4,395,863
Consumer Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 235,982 | 238,811
Nonaccrual Loans | 147 | 777
Consumer Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 568 | 689
Consumer Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 5,182 | 5,237
Consumer Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 5,897 | 6,703
Consumer Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 230,085 | 232,108
Credit Cards Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 717,831 | 700,733
Nonaccrual Loans | 589 | 508
Credit Cards Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 10,603 | 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 | 8,782 | 6,505
Credit Cards Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 19,974 | 16,207
Credit Cards Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 697,857 | 684,526
Leases and Other Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 408,923 | 238,400
Leases and Other Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 408,923 | $ 238,400

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