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Loans and ACL - Summary of Amortized Cost of TLMs (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 3,372 | $ 9,102 |  | $ 3,801 | $ 50,989
Term Extension and Forbearance | 0 |  |  | 804 |
Payment Deferral | 299 |  |  | 643 |
Total | 299 |  |  | 1,447 |
Term extension and Forbearance [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 2,150 | 8,805 |  | 2,188 | 38,958
Amortized Cost of Modified Loans to Gross Loans by Category | 0.00% |  |  |  |
Payment Deferral [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 1,222 | 0 |  | 1,613 | 8,805
Interest-only [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment |  | 297 |  |  | 3,226
Commercial and Industrial [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Term Extension and Forbearance | 0 |  | $ 0 | 350 |
Payment Deferral | 225 |  |  | 569 |
Commercial and Industrial [Member] | Term extension and Forbearance [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 335 | $ 5,806 | $ 32,800 | $ 335 | $ 32,750
Recorded Investment of Modified Loans to Gross Loans by Category | 0.09% | 1.09% |  | 0.09% | 6.14%
Amortized Cost of Modified Loans to Gross Loans by Category |  |  |  | 0.09% |
Commercial and Industrial [Member] | Payment Deferral [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 644 | $ 0 |  | $ 1,024 | $ 5,806
Recorded Investment of Modified Loans to Gross Loans by Category | 0.17% | 0.00% |  | 0.27% | 0.66%
Amortized Cost of Modified Loans to Gross Loans by Category | 0.06% |  |  | 0.15% |
Commercial and Industrial [Member] | Interest-only [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment |  | $ 297 |  |  | $ 2,982
Recorded Investment of Modified Loans to Gross Loans by Category |  | 0.06% |  |  | 0.34%
Commercial [Member] | Real Estate [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Term Extension and Forbearance | $ 0 |  |  | $ 299 |
Payment Deferral | $ 74 |  |  | 74 |
Amortized Cost of Modified Loans to Gross Loans by Category | 0.00% |  |  |  |
Commercial [Member] | Term extension and Forbearance [Member] | Real Estate [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 1,743 | $ 2,999 |  | $ 1,781 | $ 6,208
Recorded Investment of Modified Loans to Gross Loans by Category | 0.20% | 0.34% |  | 0.20% | 0.71%
Amortized Cost of Modified Loans to Gross Loans by Category |  |  |  | 0.03% |
Commercial [Member] | Payment Deferral [Member] | Real Estate [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 74 | $ 0 |  | $ 74 | $ 2,999
Recorded Investment of Modified Loans to Gross Loans by Category | 0.01% | 0.00% |  | 0.01% | 0.34%
Amortized Cost of Modified Loans to Gross Loans by Category | 0.01% |  |  | 0.01% |
Commercial [Member] | Interest-only [Member] | Real Estate [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment |  | $ 0 |  |  | $ 244
Recorded Investment of Modified Loans to Gross Loans by Category |  | 0.00% |  |  | 0.03%
Residential [Member] | Term extension and Forbearance [Member] | Real Estate [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 72 |  |  | $ 72 |
Recorded Investment of Modified Loans to Gross Loans by Category | 0.01% |  |  | 0.01% |
Residential [Member] | Payment Deferral [Member] | Real Estate [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 504 |  |  | $ 504 |
Recorded Investment of Modified Loans to Gross Loans by Category | 0.07% |  |  | 0.07% |
Construction, Residential [Member] | Real Estate [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Term Extension and Forbearance | $ 0 |  |  | $ 155 |
Amortized Cost of Modified Loans to Gross Loans by Category | 0.00% |  |  |  |
Construction, Residential [Member] | Term extension and Forbearance [Member] | Real Estate [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Amortized Cost of Modified Loans to Gross Loans by Category |  |  |  | 0.36% |
Consumer loans [Member] | Payment Deferral [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Recorded Investment | $ 0 |  |  | $ 11 |
Recorded Investment of Modified Loans to Gross Loans by Category | 0.00% |  |  | 0.02% |

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