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Deposits - Scheduled Maturities of Other Time Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
2019 $ 165,628  
2020 67,500  
2021 50,810  
2022 9,177  
2023 23,042  
Other time deposits $ 316,157 $ 304,969