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Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income $ 18,932,074 $ 12,656,429
90 Days or More Past Due and Accruing 19,430 13,555
Loans held for sale 125,971 18,695
Total loans, current 18,883,562 12,586,007
Total loans 19,058,045 12,675,124
Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,091,636 821,110
90 Days or More Past Due and Accruing 1,890 1,150
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 10,755,370 7,326,681
90 Days or More Past Due and Accruing 5,311 5,561
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 3,928,469 2,520,086
90 Days or More Past Due and Accruing 9,754 2,489
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 384,693 201,275
90 Days or More Past Due and Accruing 1,305 857
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,826,642 1,352,083
90 Days or More Past Due and Accruing 2,670  
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 8,928,728 5,974,598
90 Days or More Past Due and Accruing 2,641 5,561
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 2,771,906 1,787,277
90 Days or More Past Due and Accruing 1,170 3,498
Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 94,463 39,752
Current [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 18,757,591 12,567,312
Loans held for sale, current 125,971 18,695
Current [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,070,163 806,025
Current [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 10,704,153 7,286,414
Current [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 3,881,100 2,506,959
Current [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 374,694 195,082
Current [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,820,502 1,351,251
Current [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 8,883,651 5,935,163
Current [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 2,727,481 1,772,832
Current [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 19,743 10,117
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 47,493 22,254
30-59 Days Past Due [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 10,490 7,420
30-59 Days Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 8,119 8,478
30-59 Days Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,257 1,483
30-59 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 5,431 3,916
30-59 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 369 832
30-59 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 7,750 7,646
30-59 Days Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 22,196 957
30-59 Days Past Due [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 751 684
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 40,865 24,970
60-89 Days Past Due [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 4,533 3,043
60-89 Days Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 12,900 8,148
60-89 Days Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 18,916 3,523
60-89 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 2,349 1,384
60-89 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,413  
60-89 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 11,487 8,148
60-89 Days Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 2,167 8,872
60-89 Days Past Due [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 7,274 613
90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 86,125 41,893
90 Days or More Past Due [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 6,450 4,622
90 Days or More Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 30,198 23,641
90 Days or More Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 27,196 8,121
90 Days or More Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 2,219 893
90 Days or More Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 4,358  
90 Days or More Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 25,840 23,641
90 Days or More Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 20,062 4,616
90 Days or More Past Due [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 66,695 28,338
Total Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 174,483 89,117
Total Past Due [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 21,473 15,085
Total Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 51,217 40,267
Total Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 47,369 13,127
Total Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 9,999 6,193
Total Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 6,140 832
Total Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 45,077 39,435
Total Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 44,425 14,445
Total Past Due [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income $ 74,720 $ 29,635