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Loans and ACL - Summary of Change in the ACL by Major Loan Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Financing Receivable Impaired [Line Items]    
Balance, beginning of period $ 35,893 [1] $ 30,740
Charge-offs (2,702) (1,309)
Recoveries 1,834 222
Net charge-offs (868) (1,087)
(Recovery of) provision for credit losses - loans 0 (1,110)
Balance, end of period 35,025 35,961
Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Balance, beginning of period 27,491 27,070
Charge-offs (1,957) (799)
Recoveries 1,531 118
Net charge-offs (426) (681)
(Recovery of) provision for credit losses - loans   (2,049)
Balance, end of period 27,065 27,266
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Balance, beginning of period 8,402 3,670
Charge-offs (745) (510)
Recoveries 303 104
Net charge-offs (442) (406)
(Recovery of) provision for credit losses - loans   939
Balance, end of period $ 7,960 8,695
Impact of ASC 326 Adoption [Member]    
Financing Receivable Impaired [Line Items]    
Impact of ASC 326 adoption   7,418
Impact of ASC 326 Adoption [Member] | Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
Impact of ASC 326 adoption   2,926
Impact of ASC 326 Adoption [Member] | Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Impact of ASC 326 adoption   $ 4,492
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.