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Loans and the Allowance for Credit Losses - Summary of Commercial Loans by Risk Grade (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | $ 18,932,074 | $ 12,656,429
Commercial and Industrial [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,771,906 | 1,787,277
Commercial and Industrial [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,642,071 | 1,721,309
Commercial and Industrial [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 85,804 | 48,805
Commercial and Industrial [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 44,031 | 17,163
Commercial Portfolio Segment [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 13,527,276 | 9,113,958
Commercial Portfolio Segment [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 12,918,308 | 8,759,289
Commercial Portfolio Segment [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 433,320 | 242,000
Commercial Portfolio Segment [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 175,648 | 112,669
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 1,826,642 | 1,352,083
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 1,768,314 | 1,347,374
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 43,431 | 3,873
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 14,897 | 836
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 8,928,728 | 5,974,598
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 8,507,923 | 5,690,606
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 304,085 | 189,322
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 116,720 | 94,670
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,771,906 | 1,787,277
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,642,071 | 1,721,309
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 85,804 | 48,805
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | $ 44,031 | $ 17,163

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