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Allowance for Loan Losses - Schedule of Changes in Amortized Yield for PCI Loans (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Movement Schedule Roll Forward    
Balance at beginning of period $ 255,000 $ 336,000
Acquisition of PCI loans 0 0
Accretion (336,000) (164,000)
Transfers from non-accretable to accretable 306,000 83,000
Balance at end of period $ 225,000 $ 255,000