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FAIR VALUE - FAIR VALUE ON NON-RECURRING (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Impaired Loans            
Valuation allowance of impaired loans $ 201   $ 201   $ 23  
Provision for loan loss expense 150 $ 100 400 $ 650    
Other real estate owned, net:            
Outstanding balance of other real estate owned 1,004 2,669 1,004 2,669 2,404 $ 1,824
Valuation allowance of other real estate owned 413 $ 898 413 898 777 $ 803
Write downs of other real estate owned       $ 141    
Loan servicing rights            
Mortgage servicing rights 1,614   1,614   1,511  
Non-recurring            
Impaired Loans            
Impaired loans, at fair value 127   127   183  
Valuation allowance of impaired loans 10   $ 10   23  
Number of impaired loans. | loan   1 4 1    
Provision for loan loss expense 0 $ 68 $ 201 $ 68    
Other real estate owned, net:            
Other real estate owned 339   339   1,100  
Outstanding balance of other real estate owned 752   752   1,900  
Valuation allowance of other real estate owned 413   413   777  
Write downs of other real estate owned 0 103 0 141    
Loan servicing rights            
Mortgage servicing rights         1,300  
Balance of loan servicing rights         1,400  
Valuation allowance of loan servicing rights         56  
Impaired mortgage servicing rights     0      
Recovery of prior write-downs 0 $ 6 56 $ 40    
Non-recurring | Carrying Value            
Loan servicing rights            
Mortgage servicing rights         1,323  
Non-recurring | Significant Unobservable Inputs (Level 3)            
Loan servicing rights            
Mortgage servicing rights         1,323  
Non-recurring | 1-4 family residential | Carrying Value            
Impaired Loans            
Impaired loans, at fair value 127   127   183  
Non-recurring | 1-4 family residential | Significant Unobservable Inputs (Level 3)            
Impaired Loans            
Impaired loans, at fair value 127   127   183  
Non-recurring | Residential | Carrying Value            
Other real estate owned, net:            
Other real estate owned 93   93   910  
Non-recurring | Residential | Significant Unobservable Inputs (Level 3)            
Other real estate owned, net:            
Other real estate owned 93   93   910  
Non-recurring | Commercial | Carrying Value            
Other real estate owned, net:            
Other real estate owned 246   246   200  
Non-recurring | Commercial | Significant Unobservable Inputs (Level 3)            
Other real estate owned, net:            
Other real estate owned $ 246   $ 246   $ 200