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Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | $ 24,109 | $ 17,814 |  |
Allowance for loans collectively evaluated for impairment | 209,508 | 120,952 |  |
Allowance for loan commitments | 6,459 | 6,120 | $ 8,175 | $ 8,604
Total allowance for credit losses - loans and commitments | 240,076 | 144,886 | 137,365 | 139,279
Individually evaluated for credit loss | 48,055 | 52,340 |  |
Collectively-evaluated for credit losses | 18,625,693 | 12,604,089 |  |
Total loans | 18,673,748 | 12,656,429 |  |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 6,014 | 5,353 |  |
Allowance for loans collectively evaluated for impairment | 72,749 | 37,045 |  |
Allowance for loan commitments |  |  | 553 | 429
Total allowance for credit losses - loans and commitments | 78,763 | 42,398 | 38,594 | 37,073
Individually evaluated for credit loss | 6,965 | 7,116 |  |
Collectively-evaluated for credit losses | 2,774,763 | 1,780,161 |  |
Total loans | 2,781,728 | 1,787,277 |  |
Deposit Overdraft [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 1,750 | 1,713 |  |
Total allowance for credit losses - loans and commitments | 1,750 | 1,713 | 1,235 | 1,366
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 10,501,846 | 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 | 11,335 | 8,411 |  |
Allowance for loan commitments | 5,616 | 5,105 | 6,326 | 6,894
Total allowance for credit losses - loans and commitments | 16,951 | 13,516 | 13,494 | 14,017
Collectively-evaluated for credit losses | 1,779,108 | 1,352,083 |  |
Total loans | 1,779,108 | 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 | 18,095 | 12,461 |  |
Allowance for loans collectively evaluated for impairment | 76,448 | 47,367 |  |
Total allowance for credit losses - loans and commitments | 94,543 | 59,828 | 56,104 | 59,351
Individually evaluated for credit loss | 41,090 | 45,224 |  |
Collectively-evaluated for credit losses | 8,681,648 | 5,929,374 |  |
Total loans | 8,722,738 | 5,974,598 |  |
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 32,625 | 21,790 |  |
Allowance for loan commitments | 832 | 1,015 | 1,285 | 1,276
Total allowance for credit losses - loans and commitments | 33,457 | 22,805 | 23,052 | 22,494
Collectively-evaluated for credit losses | 3,930,667 | 2,520,086 |  |
Total loans | 3,930,667 | 2,520,086 |  |
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 12,436 | 3,391 |  |
Allowance for loan commitments | 11 |  |  |
Total allowance for credit losses - loans and commitments | 12,447 | 3,391 | 3,851 | 3,956
Collectively-evaluated for credit losses | 438,578 | 201,275 |  |
Total loans | 438,578 | 201,275 |  |
Home Equity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 2,165 | 1,235 |  |
Allowance for loan commitments |  |  | 11 | 5
Total allowance for credit losses - loans and commitments | 2,165 | 1,235 | $ 1,035 | $ 1,022
Collectively-evaluated for credit losses | 1,020,929 | 821,110 |  |
Total loans | $ 1,020,929 | $ 821,110 |  |

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