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FAIR VALUE OF FINANCIAL INSTRUMENTS - Mortgage Servicing Rights (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Fair value $ 5,571 $ 5,839 $ 8,518 $ 7,936 $ 8,796
Recurring          
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Fair value 5,571   8,518    
Recurring | Level 3          
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Fair value $ 5,571   $ 8,518    
Valuation Technique us-gaap:ValuationTechniqueDiscountedCashFlowMember   us-gaap:ValuationTechniqueDiscountedCashFlowMember    
Recurring | Level 3 | Constant pre-payment rates (CPR)          
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Fair value $ 5,571   $ 8,518    
Recurring | Level 3 | Constant pre-payment rates (CPR) | Minimum          
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Measurement input 7.0   7.0    
Recurring | Level 3 | Constant pre-payment rates (CPR) | Maximum          
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Measurement input 85.0   68.5    
Recurring | Level 3 | Constant pre-payment rates (CPR) | Weighted average          
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Measurement input 18.2   12.3    
Recurring | Level 3 | Discount rate | Minimum          
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Measurement input 9.0   9.0    
Recurring | Level 3 | Discount rate | Maximum          
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Measurement input 11.0   11.0    
Recurring | Level 3 | Discount rate | Weighted average          
FAIR VALUE OF FINANCIAL INSTRUMENTS          
Measurement input 9.0   9.0