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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

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