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FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Valuation Techniques of Unobservable - Nonrecurring Basis (Details) - USD ($)	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance	$ 8,085,000		$ 3,375,000
Related allowance	651,000		1,051,000
Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance	7,434,000		2,324,000
Related allowance	651,000		1,051,000
Foreclosed assets held for sale	2,369,000		2,886,000
Residential mortgage
Valuation Techniques and the Unobservable Inputs
Foreclosed assets held for sale	104,000		292,000
Residential mortgage | Real estate loan
Valuation Techniques and the Unobservable Inputs
Related allowance	161,000		176,000
Commercial | Real estate loan
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance	6,497,000		0
Related allowance	409,000	$ 1,193,000	0	$ 678,000
Commercial | Commercial and industrial
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance	72,000		904,000
Related allowance	72,000		149,000
Commercial | Loans secured by farm land
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance	0		478,000
Related allowance	0		48,000
Impaired loans | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance	8,085,000		3,375,000
Related allowance	651,000		1,051,000
Fair value	7,434,000		2,324,000
Impaired loans | Valuation, Market Approach | Residential mortgage | Real estate loan | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance	1,516,000		732,000
Related allowance	170,000		176,000
Fair value	$ 1,346,000		$ 556,000
Impaired loans | Valuation, Market Approach | Residential mortgage | Real estate loan | Weighted average | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Discount rate	31.00%		30.00%
Impaired loans | Valuation, Market Approach | Commercial | Commercial loans secured by real estate | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance	$ 6,497,000
Related allowance	409,000
Fair value	$ 6,088,000
Impaired loans | Valuation, Market Approach | Commercial | Commercial loans secured by real estate | Weighted average | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Discount rate	38.00%
Impaired loans | Valuation, Market Approach | Commercial | Commercial and industrial | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance	$ 72,000		$ 106,000
Related allowance	72,000		89,000
Fair value	$ 0		17,000
Impaired loans | Valuation, Market Approach | Commercial | Commercial and industrial | Nonrecurring fair value measurements | Discount to borrower's financial statement value
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance			798,000
Related allowance			60,000
Fair value			$ 738,000
Impaired loans | Valuation, Market Approach | Commercial | Commercial and industrial | Weighted average | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Discount rate	100.00%		69.00%
Impaired loans | Valuation, Market Approach | Commercial | Commercial and industrial | Weighted average | Nonrecurring fair value measurements | Discount to borrower's financial statement value
Valuation Techniques and the Unobservable Inputs
Discount rate			15.00%
Impaired loans | Valuation, Market Approach | Commercial | Commercial construction and land | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance			$ 1,261,000
Related allowance			678,000
Fair value			$ 583,000
Impaired loans | Valuation, Market Approach | Commercial | Commercial construction and land | Weighted average | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Discount rate			47.00%
Impaired loans | Valuation, Market Approach | Commercial | Loans secured by farm land | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Recorded investment - with allowance			$ 478,000
Related allowance			48,000
Fair value			$ 430,000
Impaired loans | Valuation, Market Approach | Commercial | Loans secured by farm land | Weighted average | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Discount rate			46.00%
Foreclosed assets held for sale | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Foreclosed assets held for sale	$ 2,369,000		$ 2,886,000
Valuation allowance	0		0
Fair value	2,369,000		2,886,000
Foreclosed assets held for sale | Valuation, Market Approach | Land | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Foreclosed assets held for sale			70,000
Valuation allowance			0
Fair value			$ 70,000
Foreclosed assets held for sale | Valuation, Market Approach | Land | Weighted average | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Discount rate			53.00%
Foreclosed assets held for sale | Valuation, Market Approach | Commercial real estate | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Foreclosed assets held for sale	2,265,000		$ 2,524,000
Valuation allowance	0		0
Fair value	$ 2,265,000		$ 2,524,000
Foreclosed assets held for sale | Valuation, Market Approach | Commercial real estate | Weighted average | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Discount rate	34.00%		39.00%
Foreclosed assets held for sale | Valuation, Market Approach | Residential mortgage | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Foreclosed assets held for sale	$ 104,000		$ 292,000
Valuation allowance	0		0
Fair value	$ 104,000		$ 292,000
Foreclosed assets held for sale | Valuation, Market Approach | Residential mortgage | Weighted average | Nonrecurring fair value measurements
Valuation Techniques and the Unobservable Inputs
Discount rate	47.00%		46.00%

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