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MORTGAGE SERVICING RIGHTS - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets [Line Items]      
Deposits $ 1,380,202   $ 1,295,256
Servicing fees $ 352 $ 339  
Discounted rates | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Servicing asset, measurement input 0.09   0.09
Discounted rates | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Servicing asset, measurement input 0.12   0.12
Core Deposits      
Finite-Lived Intangible Assets [Line Items]      
Deposits $ 4,979   $ 2,890
Mortgage servicing rights      
Finite-Lived Intangible Assets [Line Items]      
Residential mortgage loans serviced for others $ 551,622   $ 553,655