INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Income Tax Disclosure [Abstract]
Tax credits generated from investments in affordable housing partnerships and other investments									$ 67,600		$ 85,700		$ 35,000
Net deferred tax assets	$ 135,871				$ 389,601				135,871		389,601
Current income tax (benefit) expense:
Federal									(62,829)		174,640		152,061
State									(4,750)		70,527		44,389
Foreign									409		3,846		208
Total current income tax (benefit) expense									(67,170)		249,013		196,658
Deferred income tax expense (benefit):
Federal									199,858		(111,122)		(31,293)
State									60,437		(36,040)		(13,155)
Foreign									919		(706)		1,612
Total deferred income tax expense (benefit)									261,214		(147,868)		(42,836)
Income tax expense (1)	$ 56,680	$ 44,892	$ 45,673	$ 46,799	$ 27,093	$ (6,601)	$ 38,661	$ 41,992	$ 194,044	[1]	$ 101,145	[1]	$ 153,822	[1]
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)									6.30%		5.00%		4.60%
Tax credits (as a percent)									(8.70%)		(16.70%)		(4.80%)
Other, net (as a percent)									0.90%		(0.70%)		(0.40%)
Effective income tax rate (as a percent)									33.50%		22.60%		34.40%

[1] Prior period was restated to reflect the retrospective application of adopting the new accounting guidance related to the Company’s investments in qualified affordable housing projects Accounting Standards Update (“ASU”) 2014-01. Please see Note 9 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net to the Consolidated Financial Statements for additional information.