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FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Valuation Techniques and the Unobservable Inputs Used in Determining Fair Value - Nonrecurring Basis (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Recorded investment - with allowance	$ 12,189,000	$ 3,375,000
Related allowance	1,956,000	1,051,000
Nonrecurring fair value measurements
Recorded investment - with allowance	10,233,000	2,324,000
Related allowance	1,956,000	1,051,000
Foreclosed assets held for sale	1,593,000	2,886,000
Residential mortgage
Foreclosed assets held for sale	118,000	292,000
Residential mortgage | Real estate loan
Related allowance	154,000	176,000
Commercial | Real estate loan
Recorded investment - with allowance	6,754,000	0
Related allowance	494,000	0
Commercial | Commercial and industrial
Recorded investment - with allowance	3,580,000	904,000
Related allowance	1,264,000	149,000
Commercial | Loans secured by farm land
Recorded investment - with allowance	335,000	478,000
Related allowance	34,000	48,000
Impaired loans | Nonrecurring fair value measurements
Recorded investment - with allowance	12,189,000	3,375,000
Related allowance	1,956,000	1,051,000
Fair value	10,234,000	2,324,000
Impaired loans | Valuation, Market Approach | Residential mortgage | Real estate loan | Nonrecurring fair value measurements
Recorded investment - with allowance	1,520,000	732,000
Related allowance	164,000	176,000
Fair value	$ 1,355,000	$ 556,000
Impaired loans | Valuation, Market Approach | Residential mortgage | Real estate loan | Weighted average | Nonrecurring fair value measurements
Discount rate	31.00%	30.00%
Impaired loans | Valuation, Market Approach | Commercial | Commercial loans secured by real estate | Nonrecurring fair value measurements
Recorded investment - with allowance	$ 6,754,000
Related allowance	494,000
Fair value	$ 6,261,000
Impaired loans | Valuation, Market Approach | Commercial | Commercial loans secured by real estate | Weighted average | Nonrecurring fair value measurements
Discount rate	38.00%
Impaired loans | Valuation, Market Approach | Commercial | Commercial and industrial | Nonrecurring fair value measurements
Recorded investment - with allowance	$ 3,580,000	$ 106,000
Related allowance	1,264,000	89,000
Fair value	$ 2,316,000	17,000
Impaired loans | Valuation, Market Approach | Commercial | Commercial and industrial | Nonrecurring fair value measurements | Discount to borrower's financial statement value
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
Discount rate	35.00%	69.00%
Impaired loans | Valuation, Market Approach | Commercial | Commercial and industrial | Weighted average | Nonrecurring fair value measurements | Discount to borrower's financial statement value
Discount rate		15.00%
Impaired loans | Valuation, Market Approach | Commercial | Commercial construction and land | Nonrecurring fair value measurements
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
Discount rate		47.00%
Impaired loans | Valuation, Market Approach | Commercial | Loans secured by farm land | Nonrecurring fair value measurements
Recorded investment - with allowance	$ 335,000	$ 478,000
Related allowance	34,000	48,000
Fair value	$ 302,000	$ 430,000
Impaired loans | Valuation, Market Approach | Commercial | Loans secured by farm land | Weighted average | Nonrecurring fair value measurements
Discount rate	42.00%	46.00%
Foreclosed assets held for sale | Nonrecurring fair value measurements
Foreclosed assets held for sale	$ 1,593,000	$ 2,886,000
Valuation allowance	0	0
Fair value	1,593,000	2,886,000
Foreclosed assets held for sale | Valuation, Market Approach | Land | Nonrecurring fair value measurements
Foreclosed assets held for sale	70,000	70,000
Valuation allowance	0	0
Fair value	$ 70,000	$ 70,000
Foreclosed assets held for sale | Valuation, Market Approach | Land | Weighted average | Nonrecurring fair value measurements
Discount rate	53.00%	53.00%
Foreclosed assets held for sale | Valuation, Market Approach | Commercial real estate | Nonrecurring fair value measurements
Foreclosed assets held for sale	$ 1,405,000	$ 2,524,000
Valuation allowance	0	0
Fair value	$ 1,405,000	$ 2,524,000
Foreclosed assets held for sale | Valuation, Market Approach | Commercial real estate | Weighted average | Nonrecurring fair value measurements
Discount rate	38.00%	39.00%
Foreclosed assets held for sale | Valuation, Market Approach | Residential mortgage | Nonrecurring fair value measurements
Foreclosed assets held for sale	$ 118,000	$ 292,000
Valuation allowance	0	0
Fair value	$ 118,000	$ 292,000
Foreclosed assets held for sale | Valuation, Market Approach | Residential mortgage | Weighted average | Nonrecurring fair value measurements
Discount rate	55.00%	46.00%

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