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MORTGAGE BANKING ACTIVITIES - COMPONENTS OF INCOME (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mortgage servicing rights    
Net gain realized on sale of mortgage loans held for sale $ 875 $ 597
Net gain recognized 1,260 777
Loan servicing income 601 605
Amortization of mortgage servicing rights (322) (362)
Net servicing income recognized 279 243
Total Mortgage banking income 1,539 1,020
Mortgage loans held for sale    
Mortgage servicing rights    
Net change in fair value (82) (9)
Rate lock loan commitments    
Mortgage servicing rights    
Net change in fair value 487 133
Mandatory forward contracts    
Mortgage servicing rights    
Net change in fair value $ (20) $ 56