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Related Party Transactions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Related Party Transactions [Abstract]    
Aggregate of loans and credit cards total $ 8,596 $ 5,331
Payments to fund long-term loans to related parties 18,020  
Net change in outstanding credit card 26  
Repayment total 14,781  
Deposits $ 9,619 $ 11,982