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Deposits - Scheduled Maturities for Time Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Maturities of Time Deposits [Abstract]    
2018 $ 83,734  
2019 38,274  
2020 25,787  
2021 26,441  
2022 12,701  
Thereafter 629  
Total $ 187,566 $ 198,830