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Loans and the Allowance for Credit Losses - Summary of Commercial Loans by Risk Grade (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | $ 10,703,312 | $ 10,789,233
Commercial and Industrial [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,422,735 | 2,407,438
Commercial and Industrial [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,365,558 | 2,350,724
Commercial and Industrial [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 37,782 | 34,597
Commercial and Industrial [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 19,395 | 22,117
Commercial Portfolio Segment [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 8,135,477 | 8,112,830
Commercial Portfolio Segment [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 7,679,650 | 7,617,885
Commercial Portfolio Segment [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 340,943 | 362,295
Commercial Portfolio Segment [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 114,884 | 132,650
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 642,017 | 668,277
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 | 634,835 | 657,435
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 | 5,360 | 7,397
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 | 1,822 | 3,445
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 5,070,725 | 5,037,115
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 | 4,679,257 | 4,609,726
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 | 297,801 | 320,301
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 | 93,667 | 107,088
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,422,735 | 2,407,438
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 2,365,558 | 2,350,724
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Criticized [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | 37,782 | 34,597
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Classified - substandard [Member] |  |
Summary of commercial loans by risk grade |  |
Portfolio loans, net of unearned income | $ 19,395 | $ 22,117

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