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Related Party Transactions - Summary of Loan Transactions with Related Parties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Related Party Transactions [Abstract]    
Beginning balance $ 14,168 $ 9,608
Advances 12,472 7,916
Curtailments (12,683) (3,356)
Ending balance $ 13,957 $ 14,168