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FAIR VALUE - Summary of Additional Qualitative Information (Details) - Fair Value, Measurements, Nonrecurring
$ in Thousands
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Impaired loans | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent)   0.06
Impaired loans | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent)   0.19
Impaired loans | Discount Rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent) 0.06  
Impaired loans | Discount Rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent) 0.18  
Impaired loans | Appraisal of collateral    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Estimate $ 1,599 $ 1,621
Impaired loans | Appraisal of collateral | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent)   0.05
Impaired loans | Appraisal of collateral | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent)   0.25
Impaired loans | Appraisal of collateral | Discount Rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent) 0.10  
Impaired loans | Appraisal of collateral | Discount Rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent) 0.25  
Mortgage servicing rights | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value Estimate $ 3,642 $ 2,745
Mortgage servicing rights | Discounted cash flow | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent) 0.0904 0.0956
Mortgage servicing rights | Discounted cash flow | Constant Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, measurement input (percent) 0.1453 0.1802