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Allowance for Loan Losses - Schedule of Changes in Accretable Yield for PCI Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Movement Schedule Roll Forward        
Balance at beginning of period $ 216 $ 224 $ 217 $ 225
Acquisition of PCI loans 0 0 0 0
Accretion (4) (55) (20) (56)
Transfer from non-accretable to accretable 4 55 19 55
Balance at end of period $ 216 $ 224 $ 216 $ 224