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Interest-Bearing Deposits - Scheduled Maturities of Time Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deposits [Abstract]    
2017 $ 419,197  
2018 88,783  
2019 22,997  
2020 16,222  
2021 and thereafter 15,765  
Total $ 562,964 $ 835,851