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Deposits - Scheduled Maturities for Time Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Maturities Of Time Deposits [Abstract]    
2019 $ 88,388  
2020 44,517  
2021 27,980  
2022 16,070  
2023 9,904  
Thereafter 554  
Total $ 187,413 $ 187,566