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LOAN SERVICING LOAN SERVICING - Fair Value of MSRs to Changes in Key Assumptions (Details) - Mortgage Loan Servicing - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]    
Composition of mortgage loans serviced for others: (as a percent) 100.00% 100.00%
Weighted average life (years) 6 years 26 days 6 years 7 months 6 days
Prepayment speed (as a percent) 11.30% 9.98%
Discount rate (as a percent) 9.46% 9.66%
0.25% $ 492 $ 421
0.50% 864 660
- 0.25% (536) (599)
- 0.50% $ (955) $ (1,104)
Fixed rate loans    
Servicing Assets at Fair Value [Line Items]    
Composition of mortgage loans serviced for others: (as a percent) 99.90% 99.90%
Adjustable rate loans    
Servicing Assets at Fair Value [Line Items]    
Composition of mortgage loans serviced for others: (as a percent) 0.10% 0.10%