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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Trouble Debt Restructuring (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Contract
Dec. 31, 2016
USD ($)
Contract
Dec. 31, 2015
USD ($)
Contract
LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES [Abstract]      
Reserves of allowance for loan losses $ 41 $ 29 $ 37
Recidivism receivables [Abstract]      
Number of contract, subsequently defaults | Contract 2 0 0
Total recidivism, Recorded investment $ 632 $ 0 $ 0
Interest Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 0 0 1
Pre-modification outstanding recorded investment $ 0 $ 0 $ 71
Post-modification outstanding recorded investment $ 0 $ 0 $ 71
Term Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 12 19 1
Pre-modification outstanding recorded investment $ 8,691 $ 7,778 $ 19
Post-modification outstanding recorded investment $ 8,691 $ 7,778 $ 19
Real Estate Loans [Member] | Home Equity [Member] | Interest Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 0    
Pre-modification outstanding recorded investment $ 0    
Post-modification outstanding recorded investment $ 0    
Real Estate Loans [Member] | Home Equity [Member] | Term Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 1    
Pre-modification outstanding recorded investment $ 25    
Post-modification outstanding recorded investment $ 25    
Real Estate Loans [Member] | Mortgages [Member] | Interest Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract     1
Pre-modification outstanding recorded investment     $ 71
Post-modification outstanding recorded investment     $ 71
Real Estate Loans [Member] | Mortgages [Member] | Term Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract     1
Pre-modification outstanding recorded investment     $ 19
Post-modification outstanding recorded investment     $ 19
Real Estate Loans [Member] | Commercial [Member] | Interest Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 0 0  
Pre-modification outstanding recorded investment $ 0 $ 0  
Post-modification outstanding recorded investment $ 0 $ 0  
Real Estate Loans [Member] | Commercial [Member] | Term Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 5 4  
Pre-modification outstanding recorded investment $ 7,021 $ 1,188  
Post-modification outstanding recorded investment $ 7,021 $ 1,188  
Real Estate Loans [Member] | Agricultural [Member] | Interest Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 0 0  
Pre-modification outstanding recorded investment $ 0 $ 0  
Post-modification outstanding recorded investment $ 0 $ 0  
Real Estate Loans [Member] | Agricultural [Member] | Term Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 4 5  
Pre-modification outstanding recorded investment $ 1,475 $ 1,956  
Post-modification outstanding recorded investment $ 1,475 $ 1,956  
Other Commercial Loans [Member] | Interest Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 0 0  
Pre-modification outstanding recorded investment $ 0 $ 0  
Post-modification outstanding recorded investment $ 0 $ 0  
Other Commercial Loans [Member] | Term Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 1 3  
Pre-modification outstanding recorded investment $ 9 $ 3,076  
Post-modification outstanding recorded investment $ 9 $ 3,076  
Other Agricultural Loans [Member]      
Recidivism receivables [Abstract]      
Number of contract, subsequently defaults | Contract 2 0 0
Total recidivism, Recorded investment $ 632 $ 0 $ 0
Other Agricultural Loans [Member] | Interest Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 0 0  
Pre-modification outstanding recorded investment $ 0 $ 0  
Post-modification outstanding recorded investment $ 0 $ 0  
Other Agricultural Loans [Member] | Term Modification [Member]      
Financing receivable modifications [Abstract]      
Number of contracts | Contract 1 7  
Pre-modification outstanding recorded investment $ 161 $ 1,558  
Post-modification outstanding recorded investment $ 161 $ 1,558