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Fair Value - Summary of Quantitative Information about Level 3 Fair Value Measurements (Detail) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items] |  |
Impaired loans, net | $ 2,187 | $ 1,167
Selling Costs [Member] |  |
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items] |  |
Impaired loans, net | $ 2,097 | $ 1,167
Valuation Technique | Discounted appraised value | Discounted appraised value
Unobservable Input | Selling costs | Selling costs
Weighted Average | 10.00% | 10.00%
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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