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FAIR VALUE ACCOUNTING - Level 3 Fair Value Inputs (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Discounted rates | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.09 0.09
Discounted rates | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.12 0.12
Fair Value, Inputs, Level 3 | Foreclosed and repossessed assets, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of loans receivable $ 85 $ 197
Fair Value, Inputs, Level 3 | Foreclosed and repossessed assets, net | Estimated costs to sell | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed and repossessed assets, impaired loans, measurement input 0.10 0.10
Fair Value, Inputs, Level 3 | Foreclosed and repossessed assets, net | Estimated costs to sell | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed and repossessed assets, impaired loans, measurement input 0.15 0.15
Fair Value, Inputs, Level 3 | Impaired loans with allocated allowances    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of loans receivable $ 4,704 $ 3,037
Fair Value, Inputs, Level 3 | Impaired loans with allocated allowances | Estimated costs to sell | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed and repossessed assets, impaired loans, measurement input 0.10 0.10
Fair Value, Inputs, Level 3 | Impaired loans with allocated allowances | Estimated costs to sell | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed and repossessed assets, impaired loans, measurement input 0.15 0.15
Fair Value, Inputs, Level 3 | Mortgage servicing rights    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of mortgage servicing rights; end of period $ 4,005 $ 3,285
Fair Value, Inputs, Level 3 | Mortgage servicing rights | Discounted rates | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.09 0.09
Fair Value, Inputs, Level 3 | Mortgage servicing rights | Discounted rates | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.12 0.12