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Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2021 | $ 256 |
2022 | 1,002 |
2023 | 974 |
2024 | 937 |
2025 | 840 |
Thereafter | 3,729 |
Net Carrying Amount | 7,738 |
MSRs [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2021 | 33 |
2022 | 134 |
2023 | 133 |
2024 | 133 |
2025 | 132 |
Thereafter | 2,011 |
Net Carrying Amount | 2,576 |
Core deposit intangibles [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2021 | 223 |
2022 | 868 |
2023 | 841 |
2024 | 804 |
2025 | 708 |
Thereafter | 1,718 |
Net Carrying Amount | $ 5,162 | $ 5,829

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