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Loans and the Allowance for Credit Losses - Summary of Commercial Loans by Risk Grade (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | $ 10,702,728 | $ 9,733,478
Commercial and Industrial [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 1,579,395 | 1,590,320
Commercial and Industrial [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 1,538,300 | 1,540,569
Commercial and Industrial [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 25,223 | 17,733
Commercial and Industrial [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 15,872 | 32,018
Commercial Portfolio Segment [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 7,640,739 | 7,129,288
Commercial Portfolio Segment [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 7,390,239 | 6,764,757
Commercial Portfolio Segment [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 147,945 | 248,518
Commercial Portfolio Segment [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 102,555 | 116,013
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 943,887 | 833,880
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 | 911,804 | 823,316
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 | 1,329 | 7,955
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 | 30,754 | 2,609
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 5,117,457 | 4,705,088
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 | 4,940,135 | 4,400,872
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 | 121,393 | 222,830
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 | 55,929 | 81,386
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 1,579,395 | 1,590,320
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 1,538,300 | 1,540,569
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 25,223 | 17,733
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | $ 15,872 | $ 32,018

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