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Loans - Summary of Changes in Accretable Yield for PCI Loans (Detail) - PCI Loans - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period $ 702 $ 858 $ 973 $ 1,083
Accretion of acquisition accounting adjustment (64) (121) (203) (305)
Reclassifications from nonaccretable balance, net   6 5 62
Other changes, net   250 (137) 153
Balance at end of period $ 638 $ 993 $ 638 $ 993