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Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 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 29,069  
Provision for loan losses 68,553 4,450
Provision for loan commitments 339 (429)
Total provision for credit losses - loans and loan commitments 68,892 4,021
Charge-offs (4,005) (7,583)
Recoveries 1,234 1,648
Net (charge-offs) recoveries (2,771) (5,935)
Allowance for credit losses - loans, ending balance 233,617 129,190
Allowance for credit losses - loan commitments, ending balance 6,459 8,175
Total ending allowance for credit losses - loans and loan commitments 240,076 137,365
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 16,632  
Provision for loan losses 20,316 5,806
Provision for loan commitments   124
Total provision for credit losses - loans and loan commitments 20,316 5,930
Charge-offs (1,020) (4,810)
Recoveries 437 401
Net (charge-offs) recoveries (583) (4,409)
Allowance for credit losses - loans, ending balance 78,763 38,041
Allowance for credit losses - loan commitments, ending balance   553
Total ending allowance for credit losses - loans and loan commitments 78,763 38,594
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 338 194
Total provision for credit losses - loans and loan commitments 338 194
Charge-offs (416) (453)
Recoveries 115 128
Net (charge-offs) recoveries (301) (325)
Allowance for credit losses - loans, ending balance 1,750 1,235
Total ending allowance for credit losses - loans and loan commitments 1,750 1,235
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 2,747 858
Provision for loan commitments 511 (568)
Total provision for credit losses - loans and loan commitments 3,258 290
Charge-offs   (813)
Net (charge-offs) recoveries   (813)
Allowance for credit losses - loans, ending balance 11,335 7,168
Allowance for credit losses - loan commitments, ending balance 5,616 6,326
Total ending allowance for credit losses - loans and loan commitments 16,951 13,494
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 5,369  
Provision for loan losses 29,364 (3,621)
Total provision for credit losses - loans and loan commitments 29,364 (3,621)
Charge-offs (33) (58)
Recoveries 15 432
Net (charge-offs) recoveries (18) 374
Allowance for credit losses - loans, ending balance 94,543 56,104
Total ending allowance for credit losses - loans and loan commitments 94,543 56,104
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 7,739 650
Provision for loan commitments (183) 9
Total provision for credit losses - loans and loan commitments 7,556 659
Charge-offs (221) (135)
Recoveries 125 34
Net (charge-offs) recoveries (96) (101)
Allowance for credit losses - loans, ending balance 32,625 21,767
Allowance for credit losses - loan commitments, ending balance 832 1,285
Total ending allowance for credit losses - loans and loan commitments 33,457 23,052
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 7,386 538
Provision for loan commitments 11  
Total provision for credit losses - loans and loan commitments 7,397 538
Charge-offs (1,822) (1,098)
Recoveries 386 455
Net (charge-offs) recoveries (1,436) (643)
Allowance for credit losses - loans, ending balance 12,436 3,851
Allowance for credit losses - loan commitments, ending balance 11  
Total ending allowance for credit losses - loans and loan commitments 12,447 3,851
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 663 25
Provision for loan commitments   6
Total provision for credit losses - loans and loan commitments 663 31
Charge-offs (493) (216)
Recoveries 156 198
Net (charge-offs) recoveries (337) (18)
Allowance for credit losses - loans, ending balance 2,165 1,024
Allowance for credit losses - loan commitments, ending balance   11
Total ending allowance for credit losses - loans and loan commitments $ 2,165 $ 1,035