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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | $ 214 |  | $ 979
Individually evaluated loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 4,557 |  | 1,424
Fair Value Nonrecurring Basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 4,771 |  | 2,403
Total Gains/(Losses) | (2,741) |  | (1,334)
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 | 4,557 | $ 105 | 1,424
Total Gains/(Losses) | (2,710) | (107) | (1,489)
Fair Value Nonrecurring Basis | Foreclosed Assets | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | 214 |  | 979
Total Gains/(Losses) | (31) |  | 155
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 | 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 | 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 |  | 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 | 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 | 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 |  | 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 | 4,771 |  | 2,403
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 | 4,557 | $ 105 | 1,424
Fair Value Nonrecurring Basis | Level 3 | Foreclosed Assets | Foreclosed assets (Residential real estate) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets measured at fair value | $ 214 |  | $ 979

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- Definition Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
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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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