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Deposits - Scheduled Maturities of Time Certificates of Deposit (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Year of maturity:    
2018 $ 354,055  
2019 14,173  
2020 7,196  
2021 1,562  
2022 and thereafter 8,361  
Total $ 385,347 $ 382,824