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MORTGAGE BANKING ACTIVITIES - OTHER INFORMATION RELATING TO MSRS (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Mortgage Servicing Rights    
Fair value of mortgage servicing rights portfolio $ 6,868 $ 7,242
Discount rate (as percent) 12.00% 10.00%
Weighted average default rate (as percent) 1.50% 1.50%
Weighted average life in years 5 years 6 months 22 days 6 years 4 months 17 days
Minimum    
Mortgage Servicing Rights    
Monthly prepayment rate of unpaid principle balance (as percent) 108.00% 105.00%
Maximum    
Mortgage Servicing Rights    
Monthly prepayment rate of unpaid principle balance (as percent) 456.00% 369.00%