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MORTGAGE BANKING ACTIVITIES - COMPONENTS OF INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mortgage servicing rights        
Net gain realized on sale of mortgage loans held for sale $ 1,161 $ 1,754 $ 3,275 $ 3,861
Net gain realized on sale of mortgage loans transferred from held for investment to held for sale   1,129   1,129
Net gain recognized 965 3,087 3,221 5,647
Loan servicing income 527 511 1,590 1,455
Amortization of mortgage servicing rights (390) (517) (1,104) (1,200)
Net servicing income recognized 137 (6) 486 255
Total Mortgage Banking income 1,102 3,081 3,707 5,902
Mortgage loans held for sale        
Mortgage servicing rights        
Net change in fair value (102) 57 9 155
Rate lock loan commitments        
Mortgage servicing rights        
Net change in fair value (98) 69 185 604
Mandatory forward contracts        
Mortgage servicing rights        
Net change in fair value $ 4 $ 78 $ (248) $ (102)