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Loans and the Allowance for Credit Losses - Summary of Commercial Loans by Risk Grade (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | $ 18,673,748 | $ 12,656,429
Commercial and Industrial [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,781,728 | 1,787,277
Commercial and Industrial [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,634,696 | 1,721,309
Commercial and Industrial [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 116,243 | 48,805
Commercial and Industrial [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 30,789 | 17,163
Commercial Portfolio Segment [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 13,283,574 | 9,113,958
Commercial Portfolio Segment [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 12,663,503 | 8,759,289
Commercial Portfolio Segment [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 470,619 | 242,000
Commercial Portfolio Segment [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 149,452 | 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 | 1,779,108 | 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 | 1,732,773 | 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 | 44,847 | 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 | 1,488 | 836
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 8,722,738 | 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 | 8,296,034 | 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 | 309,529 | 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 | 117,175 | 94,670
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,781,728 | 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 | 2,634,696 | 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 | 116,243 | 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 | $ 30,789 | $ 17,163

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