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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 |

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