LOAN SERVICING LOAN SERVICING - Fair Value of MSRs to Changes in Key Assumptions (Details) - Mortgage Loan Servicing - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 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)	5 years 8 months 22 days	6 years 7 months 6 days
Prepayment speed (as a percent)	12.60%	9.98%
Discount rate (as a percent)	9.47%	9.66%
0.25%	$ 534	$ 421
0.50%	968	660
- 0.25%	(559)	(599)
- 0.50%	$ (1,038)	$ (1,104)
Fixed rate loans
Servicing Assets at Fair Value [Line Items]
Composition of mortgage loans serviced for others: (as a percent)	99.91%	99.90%
Adjustable rate loans
Servicing Assets at Fair Value [Line Items]
Composition of mortgage loans serviced for others: (as a percent)	0.09%	0.10%