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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