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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Remainder of 2017 $ 1,542    
2018 5,609    
2019 4,889    
2020 4,169    
2021 3,448    
Thereafter 5,254    
Finite lived assets, net $ 24,911 $ 29,701 $ 36,762