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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Estimated Annual Amortization Expense) (Details) - Core Deposit Intangibles [Member] - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Remainder of 2017 $ 3,853    
2018 6,888    
2019 5,816    
2020 4,651    
2021 3,237    
Thereafter 4,150    
Finite lived assets, net $ 28,595 $ 32,699 $ 22,378