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FAIR VALUE OF ASSETS AND LIABILITIES - Quantitative Disclosures for Level 3 Fair Value Measurements (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Recorded Investment	$ 17,767	$ 14,098	$ 20,635
Provision for loan losses	75	1,828
Fair value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Recorded Investment	3,077	6,458
Cost
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Recorded Investment	14,690	7,640
Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value disclosure	$ 12,547	$ 14,616
Impaired loans \| Measurement Input, Discount Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset, Measurement Input	0.15	0.15
Impaired loans \| Measurement Input, Discount Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset, Measurement Input	0.20	0.20
Impaired loans \| Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value disclosure	$ 2,401	$ 4,392
Foreclosed assets \| Measurement Input, Discount Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset, Measurement Input	0.10	0.10
Foreclosed assets \| Measurement Input, Discount Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset, Measurement Input	0.15	0.15
Foreclosed assets \| Fair Value, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value disclosure	$ 10,146	$ 10,224