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LOANS AND CREDIT QUALITY (Impaired Loans) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
loan
property
Mar. 31, 2020
loan
property
Dec. 31, 2020
USD ($)
Interest income recognized on impaired loans      
Mortgage loans foreclosure, number | loan 0 0  
Mortgage loans foreclosure, number sold | property 0 0  
Residential Mortgage | Real Estate      
Interest income recognized on impaired loans      
Loans in the process of foreclosure | $ $ 1.6   $ 1.6