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LOANS - LOAN SERVICING (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loan Servicing      
Unpaid principal balances of mortgage loans serviced $ 206,800 $ 196,200  
Custodial escrow balances 935 890  
Servicing Rights:      
Beginning balance 1,277 1,209 $ 1,344
Additions 483 348 270
Amortization (334) (339) (385)
Change in valuation allowance (105) 59 (20)
Ending balance 1,321 1,277 1,209
Valuation Allowance:      
Beginning balance 20 79 59
Additions expensed 109   34
Reductions credited to operations 4 59 14
Ending balance 125 20 $ 79
Fair value of servicing rights $ 1,800 $ 1,700  
Assumptions used in determination of fair value      
Discount rate (as a percent) 12.00% 12.00%  
Weighted average amortization period 16 years 3 months 18 days    
Estimated amortization expense for each of the next five years      
2017 $ 212    
2018 162    
2019 125    
2020 101    
2021 $ 82    
Minimum      
Assumptions used in determination of fair value      
Prepayment speeds (as a percent) 8.50% 8.10%  
Default rates (as a percent) 0.10% 0.10%  
Maximum      
Assumptions used in determination of fair value      
Prepayment speeds (as a percent) 45.00% 21.00%  
Default rates (as a percent) 0.90% 0.90%