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Deposits - Schedule of Maturities of Time Deposits (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Remainder of 2019 $ 280,027  
2020 215,587  
2021 79,504  
2022 40,832  
2023 72,125  
Thereafter 21,362  
Time deposits $ 709,437 $ 670,077