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Goodwill and Other Intangible Assets Core Deposit Intangible Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
2017 $ 42  
2018 171  
2019 171  
2020 171  
2021 70  
Total $ 625 $ 754