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Deposits - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deposits [Abstract]      
Balance of accounts with more than $0,000 balance $ 125,400,000 $ 108,500,000  
Interest expenses on accounts with more than $0,000 balance $ 1,100,000 $ 545,000 $ 444,000