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Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Short-term Debt [Line Items]    
Short-term borrowings $ 1,100 $ 1,675
Weighted average interest rate 2.19% 1.84%
Federal Funds Purchased [Member]    
Short-term Debt [Line Items]    
Short-term borrowings $ 1,100 $ 1,675
Short-term Debt [Member]    
Short-term Debt [Line Items]    
End of period interest rate 1.45% 2.30%