FAIR VALUE ACCOUNTING AND MEASUREMENT (Non-recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans individually evaluated for impairment	$ 28,477	$ 35,923	$ 28,477	$ 35,923
Write-downs on loans individually evaluated for impairment	1,073	1,196	3,500	4,390
Allowance on loans individually evaluated for impairment	2,015	3,419	2,015	3,419
Loans collectively evaluated for impairment	4,338,708	3,770,772	4,338,708	3,770,772
Allowance on loans collectively evaluated for impairment	$ 75,305	$ 70,912	75,305	$ 70,912
Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of real estate owned			$ 182