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Interest-Bearing Deposits - Scheduled Maturities of Time Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deposits [Abstract]    
2017 $ 509,206  
2018 198,525  
2019 111,012  
2020 20,135  
2021 and thereafter 11,338  
Total $ 850,216 $ 614,813