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Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | $ 24,918 | $ 17,814 |  |
Allowance for loans collectively evaluated for impairment | 192,748 | 120,952 |  |
Allowance for loan commitments | 7,628 | 6,120 | $ 8,225 | $ 8,604
Total allowance for credit losses - loans and commitments | 225,294 | 144,886 | 149,097 | 139,279
Individually evaluated for credit loss | 56,747 | 52,340 |  |
Collectively-evaluated for credit losses | 18,875,327 | 12,604,089 |  |
Total loans | 18,932,074 | 12,656,429 |  |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 6,811 | 5,353 |  |
Allowance for loans collectively evaluated for impairment | 57,520 | 37,045 |  |
Allowance for loan commitments | 1,434 |  | 129 | 429
Total allowance for credit losses - loans and commitments | 65,765 | 42,398 | 41,501 | 37,073
Individually evaluated for credit loss | 11,743 | 7,116 |  |
Collectively-evaluated for credit losses | 2,760,163 | 1,780,161 |  |
Total loans | 2,771,906 | 1,787,277 |  |
Deposit Overdraft [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 2,134 | 1,713 |  |
Total allowance for credit losses - loans and commitments | 2,134 | 1,713 | 1,498 | 1,366
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 10,755,370 | 7,326,681 |  |
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 10,468 | 8,411 |  |
Allowance for loan commitments | 5,251 | 5,105 | 6,831 | 6,894
Total allowance for credit losses - loans and commitments | 15,719 | 13,516 | 15,059 | 14,017
Collectively-evaluated for credit losses | 1,826,642 | 1,352,083 |  |
Total loans | 1,826,642 | 1,352,083 |  |
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 18,107 | 12,461 |  |
Allowance for loans collectively evaluated for impairment | 77,772 | 47,367 |  |
Allowance for loan commitments |  |  | 16 |
Total allowance for credit losses - loans and commitments | 95,879 | 59,828 | 61,605 | 59,351
Individually evaluated for credit loss | 45,004 | 45,224 |  |
Collectively-evaluated for credit losses | 8,883,724 | 5,929,374 |  |
Total loans | 8,928,728 | 5,974,598 |  |
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 33,005 | 21,790 |  |
Allowance for loan commitments | 933 | 1,015 | 1,249 | 1,276
Total allowance for credit losses - loans and commitments | 33,938 | 22,805 | 24,746 | 22,494
Collectively-evaluated for credit losses | 3,928,469 | 2,520,086 |  |
Total loans | 3,928,469 | 2,520,086 |  |
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 9,601 | 3,391 |  |
Allowance for loan commitments | 10 |  |  |
Total allowance for credit losses - loans and commitments | 9,611 | 3,391 | 3,526 | 3,956
Collectively-evaluated for credit losses | 384,693 | 201,275 |  |
Total loans | 384,693 | 201,275 |  |
Home Equity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 2,248 | 1,235 |  |
Allowance for loan commitments |  |  |  | 5
Total allowance for credit losses - loans and commitments | 2,248 | 1,235 | $ 1,162 | $ 1,022
Collectively-evaluated for credit losses | 1,091,636 | 821,110 |  |
Total loans | $ 1,091,636 | $ 821,110 |  |

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