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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Collateral dependent impaired loans categorized as Level 3 | $ 12,039 | $ 14,532 | $ 12,567
Specific allocation for collateral dependent impaired loans | 1,156 | 1,657 | $ 1,170
Collateral Dependent [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Specific allocation for collateral dependent impaired loans | 961,300 | 1,700 |
Level 3 [Member] | Collateral Dependent [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Collateral dependent impaired loans categorized as Level 3 | $ 7,500 | $ 7,700 |

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