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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Trouble Debt Restructuring (Details)
12 Months Ended
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