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Related Party Transactions - Summary of Loan Transactions to Related Parties (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related Party Transactions [Abstract]    
Beginning balance $ 9,608 $ 11,811
Advances 7,916 4,180
Curtailments (3,356) (6,383)
Ending balance $ 14,168 $ 9,608