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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Trouble Debt Restructuring (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) Contract | Dec. 31, 2019 USD ($) Contract | Dec. 31, 2018 USD ($) Contract
LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES [Abstract] |  |  |
Reserves of allowance for loan losses | $ 257,000 | $ 345,000 | $ 255,000
Recidivism receivables [Abstract] |  |  |
Number of contract, subsequently defaults | Contract | 1 | 4 | 5
Total recidivism, Recorded investment | $ 110,000 | $ 1,576,000 | $ 2,169,000
Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 | 0
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Post-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 17 | 20 | 13
Pre-modification outstanding recorded investment | $ 4,068,000 | $ 3,805,000 | $ 4,076,000
Post-modification outstanding recorded investment | $ 4,068,000 | $ 3,805,000 | $ 4,076,000
Real Estate Loans [Member] | Mortgages [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 | 0
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Post-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Real Estate Loans [Member] | Mortgages [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 1 | 1 | 1
Pre-modification outstanding recorded investment | $ 2,000 | $ 4,000 | $ 7,000
Post-modification outstanding recorded investment | $ 2,000 | $ 4,000 | $ 7,000
Real Estate Loans [Member] | Home Equity [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 | 0
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Post-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Real Estate Loans [Member] | Home Equity [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 1 | 1
Pre-modification outstanding recorded investment | $ 0 | $ 40,000 | $ 1,000
Post-modification outstanding recorded investment | $ 0 | $ 40,000 | $ 1,000
Real Estate Loans [Member] | Commercial [Member] |  |  |
Recidivism receivables [Abstract] |  |  |
Number of contract, subsequently defaults | Contract | 1 | 0 | 2
Total recidivism, Recorded investment | $ 110,000 | $ 0 | $ 683,000
Real Estate Loans [Member] | Commercial [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 | 0
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Post-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Real Estate Loans [Member] | Commercial [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 10 | 6 | 2
Pre-modification outstanding recorded investment | $ 2,456,000 | $ 918,000 | $ 683,000
Post-modification outstanding recorded investment | $ 2,456,000 | $ 918,000 | $ 683,000
Real Estate Loans [Member] | Agricultural [Member] |  |  |
Recidivism receivables [Abstract] |  |  |
Number of contract, subsequently defaults | Contract | 0 | 1 | 2
Total recidivism, Recorded investment | $ 0 | $ 1,439,000 | $ 1,325,000
Real Estate Loans [Member] | Agricultural [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 | 0
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Post-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Real Estate Loans [Member] | Agricultural [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 2 | 5 | 5
Pre-modification outstanding recorded investment | $ 494,000 | $ 1,731,000 | $ 3,209,000
Post-modification outstanding recorded investment | $ 494,000 | $ 1,731,000 | $ 3,209,000
Other Commercial Loans [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 |
Other Commercial Loans [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 2 | 1 |
Pre-modification outstanding recorded investment | $ 1,094,000 | $ 55,000 |
Post-modification outstanding recorded investment | $ 1,094,000 | $ 55,000 |
Other Agricultural Loans [Member] |  |  |
Recidivism receivables [Abstract] |  |  |
Number of contract, subsequently defaults | Contract | 0 | 3 | 1
Total recidivism, Recorded investment | $ 0 | $ 137,000 | $ 161,000
Other Agricultural Loans [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 | 0
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Post-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Other Agricultural Loans [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 1 | 5 | 4
Pre-modification outstanding recorded investment | $ 19,000 | $ 1,054,000 | $ 176,000
Post-modification outstanding recorded investment | $ 19,000 | $ 1,054,000 | $ 176,000
Consumer [Member] | Interest Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 |
Consumer [Member] | Term Modification [Member] |  |  |
Financing receivable modifications [Abstract] |  |  |
Number of contracts | Contract | 1 | 1 |
Pre-modification outstanding recorded investment | $ 3,000 | $ 3,000 |
Post-modification outstanding recorded investment | $ 3,000 | $ 3,000 |

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