v3.26.1
Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for credit losses - loans, beginning balance $ 218,749 $ 138,766
Allowance for credit losses - loan commitments, beginning balance 6,950 6,120
Total beginning allowance for credit losses - loans and loan commitments 225,699 144,886
Initial allowance for credit losses on acquired PCD loans   20,179
Provision for loan losses 7,501 72,021
Provision for loan commitments 790 48
Total provision for credit losses - loans and loan commitments 8,291 72,069
Charge-offs (14,321) (10,375)
Recoveries 5,846 3,275
Net (charge-offs) recoveries (8,475) (7,100)
Allowance for credit losses - loans, ending balance 217,775 223,866
Allowance for credit losses - loan commitments, ending balance 7,740 6,168
Total ending allowance for credit losses - loans and loan commitments 225,515 230,034
Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for credit losses - loans, beginning balance 64,932 42,398
Allowance for credit losses - loan commitments, beginning balance 552  
Total beginning allowance for credit losses - loans and loan commitments 65,484 42,398
Initial allowance for credit losses on acquired PCD loans   7,160
Provision for loan losses 8,983 16,833
Provision for loan commitments (89)  
Total provision for credit losses - loans and loan commitments 8,894 16,833
Charge-offs (5,972) (3,821)
Recoveries 2,732 1,367
Net (charge-offs) recoveries (3,240) (2,454)
Allowance for credit losses - loans, ending balance 70,675 63,937
Allowance for credit losses - loan commitments, ending balance 463  
Total ending allowance for credit losses - loans and loan commitments 71,138 63,937
Deposit Overdraft [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for credit losses - loans, beginning balance 1,855 1,713
Total beginning allowance for credit losses - loans and loan commitments 1,855 1,713
Provision for loan losses 185 1,664
Total provision for credit losses - loans and loan commitments 185 1,664
Charge-offs (978) (1,364)
Recoveries 408 308
Net (charge-offs) recoveries (570) (1,056)
Allowance for credit losses - loans, ending balance 1,470 2,321
Total ending allowance for credit losses - loans and loan commitments 1,470 2,321
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 10,707 8,411
Allowance for credit losses - loan commitments, beginning balance 5,499 5,105
Total beginning allowance for credit losses - loans and loan commitments 16,206 13,516
Initial allowance for credit losses on acquired PCD loans   177
Provision for loan losses (1,924) 2,317
Provision for loan commitments 676 254
Total provision for credit losses - loans and loan commitments (1,248) 2,571
Recoveries 513 11
Net (charge-offs) recoveries 513 11
Allowance for credit losses - loans, ending balance 9,296 10,916
Allowance for credit losses - loan commitments, ending balance 6,175 5,359
Total ending allowance for credit losses - loans and loan commitments 15,471 16,275
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 96,714 59,828
Total beginning allowance for credit losses - loans and loan commitments 96,714 59,828
Initial allowance for credit losses on acquired PCD loans   5,951
Provision for loan losses (1,252) 34,027
Provision for loan commitments 111  
Total provision for credit losses - loans and loan commitments (1,141) 34,027
Charge-offs (977) (678)
Recoveries 179 116
Net (charge-offs) recoveries (798) (562)
Allowance for credit losses - loans, ending balance 94,664 99,244
Allowance for credit losses - loan commitments, ending balance 111  
Total ending allowance for credit losses - loans and loan commitments 94,775 99,244
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for credit losses - loans, beginning balance 33,416 21,790
Allowance for credit losses - loan commitments, beginning balance 890 1,015
Total beginning allowance for credit losses - loans and loan commitments 34,306 22,805
Initial allowance for credit losses on acquired PCD loans   3,192
Provision for loan losses 485 9,745
Provision for loan commitments 77 (206)
Total provision for credit losses - loans and loan commitments 562 9,539
Charge-offs (1,308) (412)
Recoveries 180 199
Net (charge-offs) recoveries (1,128) (213)
Allowance for credit losses - loans, ending balance 32,773 34,514
Allowance for credit losses - loan commitments, ending balance 967 809
Total ending allowance for credit losses - loans and loan commitments 33,740 35,323
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for credit losses - loans, beginning balance 8,742 3,391
Allowance for credit losses - loan commitments, beginning balance 9  
Total beginning allowance for credit losses - loans and loan commitments 8,751 3,391
Initial allowance for credit losses on acquired PCD loans   3,095
Provision for loan losses 549 6,476
Provision for loan commitments 15 0
Total provision for credit losses - loans and loan commitments 564 6,476
Charge-offs (4,330) (3,283)
Recoveries 1,630 1,038
Net (charge-offs) recoveries (2,700) (2,245)
Allowance for credit losses - loans, ending balance 6,591 10,717
Allowance for credit losses - loan commitments, ending balance 24 0
Total ending allowance for credit losses - loans and loan commitments 6,615 10,717
Home Equity [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for credit losses - loans, beginning balance 2,383 1,235
Total beginning allowance for credit losses - loans and loan commitments 2,383 1,235
Initial allowance for credit losses on acquired PCD loans   604
Provision for loan losses 475 959
Total provision for credit losses - loans and loan commitments 475 959
Charge-offs (756) (817)
Recoveries 204 236
Net (charge-offs) recoveries (552) (581)
Allowance for credit losses - loans, ending balance 2,306 2,217
Total ending allowance for credit losses - loans and loan commitments $ 2,306 $ 2,217