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Loans and ACL - Summary of Impaired Financing Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2022
Financing Receivable Impaired [Line Items]      
Impaired financing receivable, with no specific allowance recorded, recorded investment     $ 73,643
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance     73,660
Impaired financing receivable, related allowance     11,606
Impaired financing receivable, average recorded investment $ 14,762 $ 20,638  
Impaired financing receivable, interest income recognized 85 372  
Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
Impaired financing receivable, with no specific allowance recorded, recorded investment     1,269
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance     1,289
Impaired financing receivable, related allowance     11,605
Impaired financing receivable, with an allowance recorded, recorded investment     66,386
Impaired financing receivable, with an allowance recorded, unpaid principal balance     66,386
Impaired financing receivable, with no specific allowance recorded, average recorded investment 5,197 5,568  
Impaired financing receivable, with no specific allowance recorded, interest income recognized 0 74  
Impaired financing receivable, with an allowance recorded, interest income recognized 44 77  
Impaired financing receivable, with an allowance recorded, average recorded investment 4,024 4,644  
Real Estate [Member] | Mortgage, Commercial [Member]      
Financing Receivable Impaired [Line Items]      
Impaired financing receivable, with no specific allowance recorded, recorded investment     4,507
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance     4,504
Impaired financing receivable, related allowance     1
Impaired financing receivable, with an allowance recorded, recorded investment     126
Impaired financing receivable, with an allowance recorded, unpaid principal balance     126
Impaired financing receivable, with no specific allowance recorded, average recorded investment 2,839 6,991  
Impaired financing receivable, with no specific allowance recorded, interest income recognized 26 174  
Impaired financing receivable, with an allowance recorded, interest income recognized 1 3  
Impaired financing receivable, with an allowance recorded, average recorded investment 851 1,503  
Real Estate [Member] | Construction, commercial [Member]      
Financing Receivable Impaired [Line Items]      
Impaired financing receivable, with no specific allowance recorded, recorded investment     521
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance     521
Impaired financing receivable, with no specific allowance recorded, average recorded investment 521 522  
Impaired financing receivable, with no specific allowance recorded, interest income recognized 8 16  
Real Estate [Member] | Mortgage, Residential [Member]      
Financing Receivable Impaired [Line Items]      
Impaired financing receivable, with no specific allowance recorded, recorded investment     834
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance     $ 834
Impaired financing receivable, with no specific allowance recorded, average recorded investment 1,188 1,324  
Impaired financing receivable, with no specific allowance recorded, interest income recognized 5 22  
Impaired financing receivable, with an allowance recorded, interest income recognized 1 6  
Impaired financing receivable, with an allowance recorded, average recorded investment $ 142 $ 86