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Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | $ 18,673,748 | $ 12,656,429
90 Days or More Past Due and Accruing | 10,734 | 13,555
Loans held for sale | 243,281 | 18,695
Total loans, current | 18,768,644 | 12,586,007
Total loans | 18,917,029 | 12,675,124
Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,020,929 | 821,110
90 Days or More Past Due and Accruing | 1,803 | 1,150
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 10,501,846 | 7,326,681
90 Days or More Past Due and Accruing | 4,930 | 5,561
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,930,667 | 2,520,086
90 Days or More Past Due and Accruing | 2,813 | 2,489
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 438,578 | 201,275
90 Days or More Past Due and Accruing | 601 | 857
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,779,108 | 1,352,083
90 Days or More Past Due and Accruing | 33 |
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 8,722,738 | 5,974,598
90 Days or More Past Due and Accruing | 4,897 | 5,561
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 2,781,728 | 1,787,277
90 Days or More Past Due and Accruing | 587 | 3,498
Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 81,489 | 39,752
Current [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 18,525,363 | 12,567,312
Loans held for sale, current | 243,281 | 18,695
Current [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,006,045 | 806,025
Current [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 10,435,974 | 7,286,414
Current [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,896,052 | 2,506,959
Current [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 427,484 | 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 | 1,772,867 | 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 | 8,663,107 | 5,935,163
Current [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 2,759,808 | 1,772,832
Current [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 13,593 | 10,117
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 61,602 | 22,254
30-59 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 6,422 | 7,420
30-59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 35,673 | 8,478
30-59 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 6,984 | 1,483
30-59 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 5,963 | 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 | 4,832 | 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 | 30,841 | 7,646
30-59 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 6,560 | 957
30-59 Days Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 10,533 | 684
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 22,891 | 24,970
60-89 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 2,332 | 3,043
60-89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 5,433 | 8,148
60-89 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 9,319 | 3,523
60-89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,849 | 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 | 1,376 |
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 | 4,057 | 8,148
60-89 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,958 | 8,872
60-89 Days Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 4,205 | 613
90 Days or More Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 63,892 | 41,893
90 Days or More Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 6,130 | 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 | 24,766 | 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 | 18,312 | 8,121
90 Days or More Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,282 | 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 | 33 |
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 | 24,733 | 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 | 11,402 | 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 | 53,158 | 28,338
Total Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 148,385 | 89,117
Total Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 14,884 | 15,085
Total Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 65,872 | 40,267
Total Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 34,615 | 13,127
Total Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 11,094 | 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 | 6,241 | 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 | 59,631 | 39,435
Total Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 21,920 | 14,445
Total Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | $ 67,896 | $ 29,635

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