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Goodwill and Intangible Assets - Estimated Future Amortization Expense of Core Deposit Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 236  
2019 55  
2020 43  
2021 33  
2022 29  
Thereafter 85  
Total $ 481 $ 560