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MORTGAGE SERVICING RIGHTS - Changes in mortgage servicing rights (Details) - Changes in mortgage servicing rights - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mortgage Servicing Rights    
Balance, beginning of period $ 233 $ 339
Originated 6 25
Amortization [1] (11) (68)
Balance, end of period 228 296
Valuation Allowance    
Balance, beginning of period (23)
Increase in impairment reserve [1] (2)
Balance, end of period (25)
Mortgage servicing rights, net $ 228 $ 271
[1] (1) Amortization expense and changes in the impairment reserve are recorded in mortgage servicing, net, in the consolidated statements of income.