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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Estimated Annual Amortization Expense) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]        
Year Ended December 31, 2017 $ 7,957      
Year Ended December 31, 2018 6,888      
Year Ended December 31, 2019 5,816      
Year Ended December 31, 2020 4,651      
Thereafter 7,387      
Net carrying amount 32,699      
Core Deposit Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Net carrying amount $ 32,699 $ 22,378 $ 29,701 $ 36,762