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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
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