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LOANS - LOAN SERVICING (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loan Servicing      
Unpaid principal balances of mortgage loans serviced $ 220,300 $ 206,800  
Custodial escrow balances 980 935  
Servicing Rights:      
Beginning balance 1,321 1,277 $ 1,209
Additions 436 483 348
Amortization (315) (334) (339)
Change in valuation allowance 69 (105) 59
Ending balance 1,511 1,321 1,277
Valuation Allowance:      
Beginning balance 125 20 79
Additions expensed 5 109  
Reductions credited to operations (74) (4) (59)
Ending balance 56 125 $ 20
Fair value of servicing rights $ 2,100 $ 1,800  
Assumptions used in determination of fair value      
Discount rate (as a percent) 12.00% 12.00%  
Weighted average amortization period 18 years 9 months 18 days    
Estimated amortization expense for each of the next five years      
2018 $ 214    
2019 137    
2020 113    
2021 94    
2022 $ 78    
Minimum      
Assumptions used in determination of fair value      
Prepayment speeds (as a percent) 7.30% 8.50%  
Default rates (as a percent) 0.10% 0.10%  
Maximum      
Assumptions used in determination of fair value      
Prepayment speeds (as a percent) 25.00% 45.00%  
Default rates (as a percent) 0.90% 0.90%