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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Estimated Annual Amortization Expense) (Details) - Core Deposit Intangibles [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Remainder of 2017 $ 1,348    
2018 4,659    
2019 3,976    
2020 3,291    
2021 2,511    
Thereafter 2,481    
Finite lived assets, net $ 18,266 $ 22,378 $ 29,701