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Loans and Allowance for Loan Losses - Summary of Changes in Accretable Yield on Purchased Credit Impaired Loans (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Receivables [Abstract]  
Accretable yield at acquisition date $ 190
Accretion (3)
Other changes, net 1
Balance at December 31, 2019 $ 188