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Related Party Transactions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related Party Transactions [Abstract]    
Aggregate of loans and credit cards total $ 16,337 $ 8,596
Payments to fund long-term loans to related parties 9,007  
Net change in outstanding credit card 28  
Repayment total 1,294  
Deposits $ 40,931 $ 36,214