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GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Estimated Annual Amortization Expense) (Details) - Core Deposit Intangibles [Member] - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Remainder of 2017 $ 5,730    
2018 6,571    
2019 5,317    
2020 3,814    
2021 2,659    
Thereafter 3,066    
Finite lived assets, net $ 27,157 $ 29,158 $ 32,699