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Deposits - Scheduled Maturities of Time Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Time Deposit [Abstract]    
2018 $ 548,208  
2019 139,748  
2020 9,552  
2021 6,703  
2022 4,546  
Total $ 708,757 $ 776,516