LOAN SERVICING - FAIR VALUE OF MSR TO CHANGES IN KEY ASSUMPTIONS (Details) - Mortgage Loan Servicing - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 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 10 days	6 years 7 months 6 days
Prepayment speed (as a percent)	11.40%	9.98%
Discount rate (as a percent)	9.52%	9.66%
0.25%	$ 401	$ 421
0.50%	744	660
- 0.25%	(436)	(599)
- 0.50%	$ (880)	$ (1,104)
Fixed rate loans
Servicing Assets at Fair Value [Line Items]
Composition of mortgage loans serviced for others: (as a percent)	99.94%	99.90%
Adjustable rate loans
Servicing Assets at Fair Value [Line Items]
Composition of mortgage loans serviced for others: (as a percent)	0.06%	0.10%