FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 6) (Fair Value, Measurements, Nonrecurring, Significant Unobservable Inputs (Level 3), USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Quantitative information
Non-covered impaired loans	67,811		57,751
Non-covered impaired loans | Discounted cash flow
Quantitative information
Non-covered impaired loans	11,499
Non-covered impaired loans | Discounted cash flow | Minimum
Quantitative information
Discount rate (as a percent)	0.00%
Non-covered impaired loans | Discounted cash flow | Maximum
Quantitative information
Discount rate (as a percent)	81.00%
Non-covered impaired loans | Discounted cash flow | Weighted Average
Quantitative information
Discount rate (as a percent)	49.00%
Non-covered impaired loans | Market comparables
Quantitative information
Non-covered impaired loans	56,312		57,751
Non-covered impaired loans | Market comparables | Minimum
Quantitative information
Discount rate (as a percent)	0.00%	[1]	0.00%	[1]
Non-covered impaired loans | Market comparables | Maximum
Quantitative information
Discount rate (as a percent)	100.00%	[1]	100.00%	[1]
Non-covered impaired loans | Market comparables | Weighted Average
Quantitative information
Discount rate (as a percent)	4.00%	[1]	13.00%	[1]
Non-covered OREO
Quantitative information
Non-covered OREO	15,735		13,031
Non-covered OREO | Appraisal
Quantitative information
Non-covered OREO	15,735		13,031
Selling cost (as a percent)	8.00%		8.00%
Non-covered OREO | Appraisal | Weighted Average
Quantitative information
Selling cost (as a percent)	8.00%		8.00%
Covered OREO
Quantitative information
Covered OREO	1,786		17,284

[1] Discount rate is adjusted for factors such as liquidation cost of collateral and selling cost.