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Loans and the Allowance for Credit Losses - Schedule of Recorded Investment in Loans by Category (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | $ 18,673,748 | $ 12,656,429
Loans held for sale | 243,281 | 18,695
Total loans | 18,917,029 | 12,675,124
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 2,781,728 | 1,787,277
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 10,501,846 | 7,326,681
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 1,779,108 | 1,352,083
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 8,722,738 | 5,974,598
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 3,930,667 | 2,520,086
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 438,578 | 201,275
Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | $ 1,020,929 | $ 821,110

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