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Loans and Allowance for Credit Losses - Summary of Loan Classes and Aging of Past Due Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 37,706,507 | $ 25,642,301
Nonaccrual Loans | 131,965 | 19,282
30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 84,446 | 11,503
Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,131 | 7,602
Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 222,542 | 38,387
Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 37,483,965 | 25,603,914
Commercial and Industrial Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 15,198,082 | 10,993,771
Nonaccrual Loans | 33,610 | 4,423
Commercial and Industrial Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 32,711 | 446
Commercial and Industrial Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 110 | 1
Commercial and Industrial Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 66,431 | 4,870
Commercial and Industrial Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 15,131,651 | 10,988,901
Specialty Lending Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 561,394 | 469,194
Specialty Lending Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 561,394 | 469,194
Commercial Real Estate Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 16,583,095 | 10,131,285
Nonaccrual Loans | 69,859 | 805
Commercial Real Estate Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 27,634 | 1,013
Commercial Real Estate Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 97,493 | 1,818
Commercial Real Estate Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 16,485,602 | 10,129,467
Consumer Real Estate Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,342,559 | 3,187,130
Nonaccrual Loans | 24,633 | 13,614
Consumer Real Estate Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 5,826 | 553
Consumer Real Estate Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 30,459 | 14,167
Consumer Real Estate Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,312,100 | 3,172,963
Consumer Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 223,453 | 193,860
Nonaccrual Loans | 828 | 40
Consumer Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 5,518 | 175
Consumer Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans |  | 12
Consumer Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,346 | 227
Consumer Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 217,107 | 193,633
Credit Cards Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 689,807 | 578,766
Nonaccrual Loans | 3,035 | 400
Credit Cards Portfolio [Member] | 30-89 Days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 12,757 | 9,316
Credit Cards Portfolio [Member] | Greater than 90 days Past Due and Accruing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 6,021 | 7,589
Credit Cards Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 21,813 | 17,305
Credit Cards Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 667,994 | 561,461
Leases and Other Portfolio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 108,117 | 88,295
Nonaccrual Loans | 0 | 0
Leases and Other Portfolio [Member] | Total Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans |  | 0
Leases and Other Portfolio [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 108,117 | $ 88,295

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