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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

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