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FAIR VALUE OF FINANCIAL INSTRUMENTS - Mortgage Servicing Rights (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Fair value $ 7,629 $ 5,934
Recurring    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Fair value 7,629 5,934
Recurring | Level 3    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Fair value $ 7,629 $ 5,934
Valuation Technique us-gaap:ValuationTechniqueDiscountedCashFlowMember us-gaap:ValuationTechniqueDiscountedCashFlowMember
Recurring | Level 3 | Constant pre-payment rates (CPR)    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Fair value $ 7,629 $ 5,934
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 85.0
Recurring | Level 3 | Constant pre-payment rates (CPR) | Weighted average    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Measurement input 12.3 17.3
Recurring | Level 3 | Discount rate | Minimum    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Measurement input 8.8 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