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Loans and ACL - Summary of Change in the ACL by Major Loan Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Financing Receivable Impaired [Line Items]        
Balance, beginning of period $ 38,567 $ 17,242 $ 30,740 [1] $ 12,121
Charge-offs (2,581) (748) (12,910) (6,315)
Recoveries 2,045 140 3,279 834
Net charge-offs (536) (608) (9,630) (5,481)
Provision for credit losses - loans 11,600 3,900 21,103 13,894
Balance, end of period 49,631 20,534 49,631 20,534
Commercial and Industrial [Member]        
Financing Receivable Impaired [Line Items]        
Balance, beginning of period 29,864   27,070  
Charge-offs (1,832) (31) (9,927) (4,958)
Recoveries 1,600 6 2,605 430
Net charge-offs (232)   (7,350)  
Provision for credit losses - loans 11,394   18,380  
Balance, end of period 41,026   41,026  
Consumer [Member]        
Financing Receivable Impaired [Line Items]        
Balance, beginning of period 8,703   3,670  
Charge-offs (749) (717) (1,699) (1,357)
Recoveries 445 $ 134 674 $ 404
Net charge-offs (304)   (2,280)  
Provision for credit losses - loans 206   2,723  
Balance, end of period 8,605   8,605  
Impact of ASC 326 Adoption [Member]        
Financing Receivable Impaired [Line Items]        
Balance, beginning of period     7,418  
Impact of ASC 326 adoption 7,418   7,418  
Charge-offs     12,909  
Impact of ASC 326 Adoption [Member] | Commercial and Industrial [Member]        
Financing Receivable Impaired [Line Items]        
Impact of ASC 326 adoption 2,926   2,926  
Charge-offs     9,955  
Impact of ASC 326 Adoption [Member] | Consumer [Member]        
Financing Receivable Impaired [Line Items]        
Impact of ASC 326 adoption $ 4,492   4,492  
Charge-offs     $ 2,954  
[1] Derived from audited December 31, 2022 Consolidated Financial Statements.