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Fair Value - Summary of Quantitative Information about Level 3 Fair Value Measurements (Detail) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Disclosure Of Other Real Estate Owned Measured On Nonrecurring Vasis Valuation Techniques [Line Items] |  |
Impaired loans, net | $ 8,233 | $ 2,187
Selling Costs [Member] |  |
Disclosure Of Other Real Estate Owned Measured On Nonrecurring Vasis Valuation Techniques [Line Items] |  |
Impaired loans, net | $ 8,233 | $ 2,097
Valuation Technique | Discounted appraised value | Discounted appraised value
Unobservable Input | Selling costs | Selling costs
Weighted Average | 7.00% | 10.00%
OREO | $ 227 |
Valuation Technique | Discounted appraised value |
Unobservable Input | Selling costs |
Weighted Average | 7.00% |
Discount Rate [Member] |  |
Disclosure Of Other Real Estate Owned Measured On Nonrecurring Vasis Valuation Techniques [Line Items] |  |
Impaired loans, net |  | $ 90
Valuation Technique |  | Discounted cash flows
Unobservable Input |  | Discount rate
Weighted Average |  | 6.00%

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