STOCKHOLDERS' EQUITY (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reclassifications out of accumulated other comprehensive income
Net gain on sales of investment securities	$ 5,345	$ 71	$ 10,922	$ 554
Total before tax	111,870	104,394	218,380	212,189
Tax expense	(37,855)	(33,837)	(72,274)	(73,549)
NET INCOME	74,015	70,557	146,106	138,640
Amount Reclassified from Accumulated Other Comprehensive Income
Reclassifications out of accumulated other comprehensive income
Total before tax	5,345		10,922
Tax expense	(2,245)		(4,587)
NET INCOME	3,100		6,335
Unrealized gain (loss) on investment securities available-for-sale | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassifications out of accumulated other comprehensive income
Net gain on sales of investment securities	$ 5,345		$ 10,922