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MORTGAGE BANKING ACTIVITIES - COMPONENTS OF INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mortgage servicing rights    
Net gain realized on sale of mortgage loans held for sale $ 597 $ 788
Net gain recognized 777 977
Loan servicing income 605 536
Amortization of mortgage servicing rights (362) (353)
Net servicing income recognized 243 183
Total Mortgage banking income 1,020 1,160
Mortgage loans held for sale    
Mortgage servicing rights    
Net change in fair value (9) (7)
Rate lock loan commitments    
Mortgage servicing rights    
Net change in fair value 133 319
Mandatory forward contracts    
Mortgage servicing rights    
Net change in fair value $ 56 $ (123)