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Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | $ 138,766 | $ 130,675
Allowance for credit losses - loan commitments, beginning balance | 6,120 | 8,604
Total beginning allowance for credit losses - loans and loan commitments | 144,886 | 139,279
Initial allowance for credit losses on acquired PCD loans | 22,226 |
Provision for loan losses | 72,641 | 19,774
Provision for loan commitments | 1,508 | (379)
Total provision for credit losses - loans and loan commitments | 74,149 | 19,395
Charge-offs | (20,952) | (14,159)
Recoveries | 4,985 | 4,582
Net (charge-offs) recoveries | (15,967) | (9,577)
Allowance for credit losses - loans, ending balance | 217,666 | 140,872
Allowance for credit losses - loan commitments, ending balance | 7,628 | 8,225
Total ending allowance for credit losses - loans and loan commitments | 225,294 | 149,097
Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 42,398 | 36,644
Allowance for credit losses - loan commitments, beginning balance |  | 429
Total beginning allowance for credit losses - loans and loan commitments | 42,398 | 37,073
Initial allowance for credit losses on acquired PCD loans | 7,160 |
Provision for loan losses | 19,172 | 9,987
Provision for loan commitments | 1,434 | (300)
Total provision for credit losses - loans and loan commitments | 20,606 | 9,687
Charge-offs | (5,967) | (6,744)
Recoveries | 1,568 | 1,485
Net (charge-offs) recoveries | (4,399) | (5,259)
Allowance for credit losses - loans, ending balance | 64,331 | 41,372
Allowance for credit losses - loan commitments, ending balance | 1,434 | 129
Total ending allowance for credit losses - loans and loan commitments | 65,765 | 41,501
Deposit Overdraft [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 1,713 | 1,366
Total beginning allowance for credit losses - loans and loan commitments | 1,713 | 1,366
Provision for loan losses | 1,887 | 1,119
Total provision for credit losses - loans and loan commitments | 1,887 | 1,119
Charge-offs | (2,021) | (1,324)
Recoveries | 555 | 337
Net (charge-offs) recoveries | (1,466) | (987)
Allowance for credit losses - loans, ending balance | 2,134 | 1,498
Total ending allowance for credit losses - loans and loan commitments | 2,134 | 1,498
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 8,411 | 7,123
Allowance for credit losses - loan commitments, beginning balance | 5,105 | 6,894
Total beginning allowance for credit losses - loans and loan commitments | 13,516 | 14,017
Initial allowance for credit losses on acquired PCD loans | 177 |
Provision for loan losses | 1,865 | 1,662
Provision for loan commitments | 146 | (63)
Total provision for credit losses - loans and loan commitments | 2,011 | 1,599
Charge-offs |  | (813)
Recoveries | 15 | 256
Net (charge-offs) recoveries | 15 | (557)
Allowance for credit losses - loans, ending balance | 10,468 | 8,228
Allowance for credit losses - loan commitments, ending balance | 5,251 | 6,831
Total ending allowance for credit losses - loans and loan commitments | 15,719 | 15,059
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 59,828 | 59,351
Total beginning allowance for credit losses - loans and loan commitments | 59,828 | 59,351
Initial allowance for credit losses on acquired PCD loans | 7,998 |
Provision for loan losses | 32,212 | 2,584
Provision for loan commitments |  | 16
Total provision for credit losses - loans and loan commitments | 32,212 | 2,600
Charge-offs | (4,498) | (929)
Recoveries | 339 | 583
Net (charge-offs) recoveries | (4,159) | (346)
Allowance for credit losses - loans, ending balance | 95,879 | 61,589
Allowance for credit losses - loan commitments, ending balance |  | 16
Total ending allowance for credit losses - loans and loan commitments | 95,879 | 61,605
Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 21,790 | 21,218
Allowance for credit losses - loan commitments, beginning balance | 1,015 | 1,276
Total beginning allowance for credit losses - loans and loan commitments | 22,805 | 22,494
Initial allowance for credit losses on acquired PCD loans | 3,192 |
Provision for loan losses | 8,536 | 2,365
Provision for loan commitments | (82) | (27)
Total provision for credit losses - loans and loan commitments | 8,454 | 2,338
Charge-offs | (862) | (284)
Recoveries | 349 | 198
Net (charge-offs) recoveries | (513) | (86)
Allowance for credit losses - loans, ending balance | 33,005 | 23,497
Allowance for credit losses - loan commitments, ending balance | 933 | 1,249
Total ending allowance for credit losses - loans and loan commitments | 33,938 | 24,746
Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 3,391 | 3,956
Total beginning allowance for credit losses - loans and loan commitments | 3,391 | 3,956
Initial allowance for credit losses on acquired PCD loans | 3,095 |
Provision for loan losses | 7,598 | 1,674
Provision for loan commitments | 10 |
Total provision for credit losses - loans and loan commitments | 7,608 | 1,674
Charge-offs | (6,333) | (3,270)
Recoveries | 1,850 | 1,166
Net (charge-offs) recoveries | (4,483) | (2,104)
Allowance for credit losses - loans, ending balance | 9,601 | 3,526
Allowance for credit losses - loan commitments, ending balance | 10 |
Total ending allowance for credit losses - loans and loan commitments | 9,611 | 3,526
Home Equity [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Allowance for credit losses - loans, beginning balance | 1,235 | 1,017
Allowance for credit losses - loan commitments, beginning balance |  | 5
Total beginning allowance for credit losses - loans and loan commitments | 1,235 | 1,022
Initial allowance for credit losses on acquired PCD loans | 604 |
Provision for loan losses | 1,371 | 383
Provision for loan commitments |  | (5)
Total provision for credit losses - loans and loan commitments | 1,371 | 378
Charge-offs | (1,271) | (795)
Recoveries | 309 | 557
Net (charge-offs) recoveries | (962) | (238)
Allowance for credit losses - loans, ending balance | 2,248 | 1,162
Total ending allowance for credit losses - loans and loan commitments | $ 2,248 | $ 1,162

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