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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Past Due (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Recorded investment of past due [Abstract]      
Total past due $ 15,546 $ 12,204  
Current 1,064,478 985,683  
PCI 1,859 2,638  
Total financing receivables 1,081,883 1,000,525  
90 Days past due and accruing 68 555  
Financing receivables on nonaccrual status [Abstract]      
Total past due and non-accrual 12,170 8,160  
Current and non-accrual 1,554 2,011  
PCI Loans considered non accrual 0 0  
Financing receivable nonaccrual status 13,724 10,171  
Foregone interest income 961 709 $ 603
Financing receivables on accrual status [Abstract]      
Total past due and still accruing 3,376 4,044  
Current and still accruing 1,062,924 983,672  
PCI Loans still accruing 1,859 2,638  
Total financing receivables and still accruing $ 1,068,159 990,354  
Minimum [Member]      
Financing receivables on nonaccrual status [Abstract]      
Period of past due after which loans considered as non accrual 90 days    
30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due $ 2,038 3,053  
Financing receivables on nonaccrual status [Abstract]      
Total past due and non-accrual 72 816  
Financing receivables on accrual status [Abstract]      
Total past due and still accruing 1,966 2,237  
60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 1,595 1,533  
Financing receivables on nonaccrual status [Abstract]      
Total past due and non-accrual 253 281  
Financing receivables on accrual status [Abstract]      
Total past due and still accruing 1,342 1,252  
90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due 11,913 7,618  
Financing receivables on nonaccrual status [Abstract]      
Total past due and non-accrual 11,845 7,063  
Financing receivables on accrual status [Abstract]      
Total past due and still accruing 68 555  
Real Estate Loans [Member] | Mortgages [Member]      
Recorded investment of past due [Abstract]      
Total past due 1,958 2,168  
Current 154,501 152,144  
PCI 28 33  
Total financing receivables 156,487 154,345  
90 Days past due and accruing 20 218  
Financing receivables on nonaccrual status [Abstract]      
Financing receivable nonaccrual status 1,079 1,274  
Real Estate Loans [Member] | Mortgages [Member] | 30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 483 996  
Real Estate Loans [Member] | Mortgages [Member] | 60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 789 362  
Real Estate Loans [Member] | Mortgages [Member] | 90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due 686 810  
Real Estate Loans [Member] | Home Equity [Member]      
Recorded investment of past due [Abstract]      
Total past due 428 441  
Current 58,390 59,693  
PCI 0 0  
Total financing receivables 58,818 60,134  
90 Days past due and accruing 0 0  
Financing receivables on nonaccrual status [Abstract]      
Financing receivable nonaccrual status 82 112  
Real Estate Loans [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 257 277  
Real Estate Loans [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 108 86  
Real Estate Loans [Member] | Home Equity [Member] | 90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due 63 78  
Real Estate Loans [Member] | Commercial [Member]      
Recorded investment of past due [Abstract]      
Total past due 6,336 6,228  
Current 311,608 300,396  
PCI 1,321 1,460  
Total financing receivables 319,265 308,084  
90 Days past due and accruing 36 162  
Financing receivables on nonaccrual status [Abstract]      
Financing receivable nonaccrual status 5,957 5,192  
Real Estate Loans [Member] | Commercial [Member] | 30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 999 1,353  
Real Estate Loans [Member] | Commercial [Member] | 60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 631 1,010  
Real Estate Loans [Member] | Commercial [Member] | 90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due 4,706 3,865  
Real Estate Loans [Member] | Agricultural [Member]      
Recorded investment of past due [Abstract]      
Total past due 3,305 447  
Current 281,215 238,808  
PCI 0 702  
Total financing receivables 284,520 239,957  
90 Days past due and accruing 0 30  
Financing receivables on nonaccrual status [Abstract]      
Financing receivable nonaccrual status 3,206 175  
Real Estate Loans [Member] | Agricultural [Member] | 30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 121 242  
Real Estate Loans [Member] | Agricultural [Member] | 60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 0  
Real Estate Loans [Member] | Agricultural [Member] | 90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due 3,184 205  
Real Estate Loans [Member] | Construction [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 133  
Current 33,913 13,369  
PCI 0 0  
Total financing receivables 33,913 13,502  
90 Days past due and accruing 0 0  
Financing receivables on nonaccrual status [Abstract]      
Financing receivable nonaccrual status 0 133  
Real Estate Loans [Member] | Construction [Member] | 30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 0  
Real Estate Loans [Member] | Construction [Member] | 60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 0  
Real Estate Loans [Member] | Construction [Member] | 90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 133  
Consumer [Member]      
Recorded investment of past due [Abstract]      
Total past due 63 135  
Current 9,795 9,809  
PCI 0 0  
Total financing receivables 9,858 9,944  
90 Days past due and accruing 12 7  
Financing receivables on nonaccrual status [Abstract]      
Financing receivable nonaccrual status 14 42  
Consumer [Member] | 30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 37 53  
Consumer [Member] | 60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 14 33  
Consumer [Member] | 90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due 12 49  
Other Commercial Loans [Member]      
Recorded investment of past due [Abstract]      
Total past due 2,255 2,504  
Current 71,353 69,066  
PCI 510 443  
Total financing receivables 74,118 72,013  
90 Days past due and accruing 0 32  
Financing receivables on nonaccrual status [Abstract]      
Financing receivable nonaccrual status 2,185 2,637  
Other Commercial Loans [Member] | 30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 141 132  
Other Commercial Loans [Member] | 60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 53 0  
Other Commercial Loans [Member] | 90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due 2,061 2,372  
Other Agricultural Loans [Member]      
Recorded investment of past due [Abstract]      
Total past due 1,201 148  
Current 40,985 37,661  
PCI 0 0  
Total financing receivables 42,186 37,809  
90 Days past due and accruing 0 106  
Financing receivables on nonaccrual status [Abstract]      
Financing receivable nonaccrual status 1,201 606  
Other Agricultural Loans [Member] | 30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 0  
Other Agricultural Loans [Member] | 60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 42  
Other Agricultural Loans [Member] | 90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due 1,201 106  
State and Political Subdivision Loans [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 0  
Current 102,718 104,737  
PCI 0 0  
Total financing receivables 102,718 104,737  
90 Days past due and accruing 0 0  
State and Political Subdivision Loans [Member] | 30 to 59 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 0  
State and Political Subdivision Loans [Member] | 60 to 89 Days Past Due [Member]      
Recorded investment of past due [Abstract]      
Total past due 0 0  
State and Political Subdivision Loans [Member] | 90 Days Or Greater [Member]      
Recorded investment of past due [Abstract]      
Total past due $ 0 $ 0