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Loans and Allowance for Loan Losses - Summary of Changes in Accretable Yield on Purchased Credit Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Receivables [Abstract]    
Balance, beginning of period $ 123 $ 188
Additions 10,030  
Accretion (840) (16)
Reclassification of nonaccretable difference due to improvement in expected cash flows 104  
Other changes, net 22 (1)
Balance, end of period $ 9,439 $ 171