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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  |  | $ 445
Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | $ 1,024 |  | 346
Fair Value Nonrecurring Basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | $ 1,472 | 1,472
Total Gains/(Losses) |  | (679) | (679)
Fair Value Nonrecurring Basis | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  |  | 417
Total Gains/(Losses) |  |  | (27)
Fair Value Nonrecurring Basis | Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 1,024 | 1,055 | 1,055
Total Gains/(Losses) | (309) | (652) | (652)
Fair Value Nonrecurring Basis | Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 417 |
Total Gains/(Losses) |  | (27) |
Fair Value Nonrecurring Basis | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 | 0
Fair Value Nonrecurring Basis | Level 1 | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  |  | 0
Fair Value Nonrecurring Basis | Level 1 | Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Fair Value Nonrecurring Basis | Level 1 | Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 |
Fair Value Nonrecurring Basis | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 | 0
Fair Value Nonrecurring Basis | Level 2 | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  |  | 0
Fair Value Nonrecurring Basis | Level 2 | Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 0 | 0 | 0
Fair Value Nonrecurring Basis | Level 2 | Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 0 |
Fair Value Nonrecurring Basis | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | 1,472 | 1,472
Fair Value Nonrecurring Basis | Level 3 | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  |  | 417
Fair Value Nonrecurring Basis | Level 3 | Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | $ 1,024 | 1,055 | $ 1,055
Fair Value Nonrecurring Basis | Level 3 | Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value |  | $ 417 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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