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Loans and the Allowance for Credit Losses - Schedule of Recorded Investment in Loans by Category (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | $ 18,932,074 | $ 12,656,429
Loans held for sale | 125,971 | 18,695
Total loans | 19,058,045 | 12,675,124
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 2,771,906 | 1,787,277
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 10,755,370 | 7,326,681
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 1,826,642 | 1,352,083
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 8,928,728 | 5,974,598
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 3,928,469 | 2,520,086
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 384,693 | 201,275
Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | $ 1,091,636 | $ 821,110

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