STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Reclassifications out of accumulated other comprehensive income
Net gain on sales of investment securities	$ 3,418	$ 5,577
Tax expense	(34,949)	(34,419)
NET INCOME	76,741	72,091
Investment securities available for sale | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassifications out of accumulated other comprehensive income
Tax expense	(1,435)	(2,342)
NET INCOME	1,983	3,235
Investment securities available for sale | Realized net gains on sale of securities | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassifications out of accumulated other comprehensive income
Net gain on sales of investment securities	$ 3,418	$ 5,577