FAIR VALUE - Valuation Methodology and Unobservable Inputs for Level 3 Assets (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item
Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 6,765,000	$ 12,121,000
Other Real Estate Owned [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	316,000	316,000
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 5,082,000	$ 9,499,000
Valuation Methodology	Collateral based measurements	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	16	1
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	100	100
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	55	53
Commercial Real Estate and Multi-family Residential Loans | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 1,211,000	$ 1,493,000
Valuation Methodology	Collateral based measurements	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions
Commercial Real Estate and Multi-family Residential Loans | Fair Value, Measurements, Nonrecurring [Member] | Minimum
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	21	7
Commercial Real Estate and Multi-family Residential Loans | Fair Value, Measurements, Nonrecurring [Member] | Maximum
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	74	61
Commercial Real Estate and Multi-family Residential Loans | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	53	27
Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 411,000	$ 1,061,000
Valuation Methodology	Collateral based measurements	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	10	5
Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	15	100
Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	11	14
Agribusiness and Agricultural | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 61,000	$ 57,000
Valuation Methodology	Collateral based measurements	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Agribusiness and Agricultural | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	58	61
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $		$ 11,000
Valuation Methodology		Collateral based measurements
Unobservable Inputs		Discount to reflect current market conditions and ultimate collectability
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)		36