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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]      
Remainder of 2017 $ 3,149    
2018 5,317    
2019 3,814    
2020 2,659    
2021 1,575    
Thereafter 1,490    
Finite lived assets, net $ 18,004 $ 21,426 $ 29,158