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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Dec. 31, 2015
investment
Dec. 31, 2017
USD ($)
Accounting Policies [Abstract]            
Maturity of interest bearing deposits     90 days      
Evaluation period to return past due loans to accrual status     6 months      
Balance of loans serviced for others $ 337,379   $ 337,379     $ 334,802
Finite-Lived Intangible Assets [Line Items]            
Mortgage servicing rights 2,931   2,931     2,897
Foreclosed real estate $ 286   $ 286     961
Percentage of limited partner interest 99.00%   99.00%      
Number of investments accounted for under the proportional amortization method | investment         1  
Investment in real estate partnership $ 4,006   $ 4,006     4,416
Investment in real estate partnerships, proportional amortization method 1,616   1,616     $ 1,776
Loss investment in real estate partnership 81 $ 81 250 $ 196    
Losses on investments accounted for under the proportional amortization method 53 52 160 157    
Recognition of federal tax credits 144 253 433 758    
Advertising expense $ 83 $ 138 $ 209 $ 455    
Number of significant operating segments | segment     1      
Building and Improvements | Minimum            
Property, Plant and Equipment [Line Items]            
Plant and equipment, useful life     10 years      
Building and Improvements | Maximum            
Property, Plant and Equipment [Line Items]            
Plant and equipment, useful life     40 years      
Furniture and Equipment | Minimum            
Property, Plant and Equipment [Line Items]            
Plant and equipment, useful life     3 years      
Furniture and Equipment | Maximum            
Property, Plant and Equipment [Line Items]            
Plant and equipment, useful life     15 years      
Deposit Premium            
Finite-Lived Intangible Assets [Line Items]            
Finite lives of intangible assets     10 years      
Customer Lists | Minimum            
Finite-Lived Intangible Assets [Line Items]            
Finite lives of intangible assets     10 years      
Customer Lists | Maximum            
Finite-Lived Intangible Assets [Line Items]            
Finite lives of intangible assets     15 years