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Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 36,900 | $ 36,900
Accumulated Amortization | (22,855) | (20,196)
Net Carrying Amount | 14,045 | 16,704
Core Deposit Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 33,550 | 33,550
Accumulated Amortization | (19,597) | (17,027)
Net Carrying Amount | 13,953 | 16,523
Customer Relationship Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,350 | 3,350
Accumulated Amortization | (3,258) | (3,169)
Net Carrying Amount | $ 92 | $ 181

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