INCOME TAXES (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
INCOME TAXES
Net deferred tax assets	$ 255,530,000				$ 185,713,000				$ 255,530,000	$ 185,713,000
Tax credits generated from investments in affordable housing partnerships and other investments									34,200,000	18,700,000	11,100,000
Tax credits generated from investments in affordable housing partnerships and other investments and other federal tax credits	35,000,000								35,000,000
Current income tax expense (benefit):
Federal									131,236,000	148,572,000	(86,157,000)
State									44,389,000	2,316,000	34,760,000
Foreign									208,000	5,704,000
Total current income tax expense (benefit)									175,833,000	156,592,000	(51,397,000)
Deferred income tax (benefit) expense:
Federal									(32,963,000)	(38,749,000)	193,834,000
State									(13,677,000)	26,099,000	(7,706,000)
Foreign									1,612,000		3,369,000
Total deferred income tax (benefit) expense									(45,028,000)	(12,650,000)	189,497,000
Provision for income taxes	$ 22,782,000	$ 35,749,000	$ 37,855,000	$ 34,419,000	$ 36,300,000	$ 34,093,000	$ 33,837,000	$ 39,712,000	$ 130,805,000	$ 143,942,000	$ 138,100,000
Difference between the effective tax rate implicit in the consolidated financial statements and the statutory federal income tax rate
Federal income tax provision at statutory rate (as a percent)									35.00%	35.00%	35.00%
State franchise taxes, net of federal tax effect (as a percent)									4.70%	4.30%	4.30%
Tax credits (as a percent)									(8.40%)	(5.30%)	(2.70%)
Other, net (as a percent)									(0.60%)	(0.20%)	(0.60%)
Effective income tax rate (as a percent)									30.70%	33.80%	36.00%