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Fair Value - Summary of OREO Measured on Nonrecurring Basis Valuation Techniques (Detail) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items] |  |
Other real estate owned, fair value |  | $ 134
Other real estate owned, valuation technique | Discounted appraised value | Discounted appraised value
Other real estate owned, significant unobservable inputs | Discounted for selling costs | Discounted for selling costs
Minimum [Member] | Measurement Input, Discount Rate [Member] |  |
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items] |  |
Other real estate owned, range |  | 15.00%
Maximum [Member] | Measurement Input, Discount Rate [Member] |  |
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items] |  |
Other real estate owned, range |  | 35.00%

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