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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructurings (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
contract
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 23 22
Recorded Investment | $ $ 1,985 $ 1,971
Accruing    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 13 9
Recorded Investment | $ $ 1,192 $ 930
Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 10 13
Recorded Investment | $ $ 793 $ 1,041
Commercial real estate | Accruing | Owner-occupied    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 1 0
Recorded Investment | $ $ 53 $ 0
Commercial real estate | Nonaccruing | Owner-occupied    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 1 0
Recorded Investment | $ $ 59 $ 0
Residential mortgage | Accruing | First lien    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 11 8
Recorded Investment | $ $ 1,109 $ 896
Residential mortgage | Accruing | Home equity - lines of credit    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 1 1
Recorded Investment | $ $ 30 $ 34
Residential mortgage | Nonaccruing | First lien    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 8 12
Recorded Investment | $ $ 731 $ 1,035
Installment and other loans | Nonaccruing    
Financing Receivable, Modifications [Line Items]    
Number of Contracts | contract 1 1
Recorded Investment | $ $ 3 $ 6