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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Receivables [Abstract]        
Balance, beginning of period $ 9,439 $ 169 $ 123 $ 185
Additions     10,030  
Accretion (1,625) (16) (2,465) (32)
Reclassification of nonaccretable difference due to improvement in expected cash flows 2   106  
Other changes, net 14   36  
Balance, end of period $ 7,830 $ 153 $ 7,830 $ 153