INVESTMENTS IN DEBT AND EQUITY SECURITIES (Textual) (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013 security	Jun. 30, 2012	Dec. 31, 2014 security	Dec. 31, 2013 security	Dec. 31, 2012
Proceeds from sales of investment securities available for sale			$ 343,548,000	$ 143,675,000	$ 315,238,000
Securities pledged as collateral	283,700,000		349,000,000	283,700,000
Reclassification of investment securities from available for sale to held to maturity	242,540,000	729,142,000	0	242,540,000	729,142,000
Gross unrealized gain on securities reclassified from available-for-sale to held-to-maturity	5,000,000	11,700,000
Number of securities in unrealized loss positions greater than or equal to 12 months	12		47	12
State and political subdivisions [Member]
Other-than-temporary impairment loss on a single municipal security classified as held-to-maturity	$ 407,000