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Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 1,675 | $ 900
Weighted average interest rate | 1.84% | 0.97%
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 1,675 | $ 900
Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
End of period interest rate | 2.30% | 1.38%

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