FAIR VALUE ACCOUNTING - Level 3 Fair Value Inputs (Details) $ in Thousands	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021
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	$ 1,584	$ 1,408
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	$ 5,961	$ 5,580
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	$ 5,795	$ 4,312
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