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MORTGAGE BANKING ACTIVITIES - COMPONENTS OF INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mortgage servicing rights    
Net gain realized on sale of mortgage loans held for sale $ 788 $ 841
Net gain recognized 977 1,095
Loan servicing income 536 471
Amortization of mortgage servicing rights (353) (305)
Net servicing income recognized 183 166
Total Mortgage Banking income 1,160 1,261
Mortgage loans held for sale    
Mortgage servicing rights    
Net change in fair value (7) 59
Rate lock loan commitments    
Mortgage servicing rights    
Net change in fair value 319 275
Mandatory forward contracts    
Mortgage servicing rights    
Net change in fair value $ (123) $ (80)