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Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Short-term Debt [Line Items] |  |
Short-term borrowings | $ 1,100 | $ 1,100
Weighted average interest rate | 0.30% | 2.19%
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 1,100 | $ 1,100
Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
End of period interest rate | 0.05% | 1.45%

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