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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Remainder of 2017 $ 1,910    
2018 6,875    
2019 5,805    
2020 4,643    
2021 3,231    
Thereafter 4,146    
Finite lived assets, net $ 26,610 $ 32,699 $ 22,378