SEGMENT INFORMATION (Details 2) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014		Jun. 30, 2015	Jun. 30, 2014		Dec. 31, 2014
Segment Reporting Information
Interest income		$ 255,445	$ 294,442		$ 518,706	$ 580,615
Charge for funds used		(73,408)	(68,064)		(143,502)	(128,560)
Interest spread on funds used		182,037	226,378		375,204	452,055
Interest expense		(27,953)	(27,992)		(55,497)	(56,199)
Credit on funds provided		73,408	68,064		143,502	128,560
Interest spread on funds provided		45,455	40,072		88,005	72,361
Net interest income (loss)		227,492	266,450		463,209	524,416
(Reversal of) provision for loan losses		3,494	8,000		8,481	14,933
Depreciation, amortization and accretion	[1]	6,119	14,958	[2]	10,246	24,021	[2]
Goodwill		469,433	458,467		469,433	458,467		$ 469,433
Segment pre-tax profit (loss)		144,421	122,966	[2]	291,247	239,129	[2]
Segment assets		30,064,072	27,557,000	[2]	30,064,072	27,557,000	[2]	$ 28,743,592	[2]
Retail Banking
Segment Reporting Information
Interest income		82,729	99,792		170,175	198,517
Charge for funds used		(21,357)	(23,854)		(44,656)	(48,150)
Interest spread on funds used		61,372	75,938		125,519	150,367
Interest expense		(12,996)	(11,950)		(25,219)	(23,661)
Credit on funds provided		60,950	54,139		118,618	102,332
Interest spread on funds provided		47,954	42,189		93,399	78,671
Net interest income (loss)		109,326	118,127		218,918	229,038
(Reversal of) provision for loan losses		(3,454)	(440)		(2,723)	2,212
Depreciation, amortization and accretion	[1]	3,235	4,096	[2]	4,917	6,667	[2]
Goodwill		357,207	354,163		357,207	354,163
Segment pre-tax profit (loss)		55,349	48,939	[2]	108,284	93,355	[2]
Segment assets		7,373,641	7,822,020	[2]	7,373,641	7,822,020	[2]
Commercial Banking
Segment Reporting Information
Interest income		157,337	181,880		316,122	350,956
Charge for funds used		(38,328)	(34,281)		(75,678)	(66,098)
Interest spread on funds used		119,009	147,599		240,444	284,858
Interest expense		(4,710)	(3,421)		(8,973)	(6,701)
Credit on funds provided		7,995	8,983		16,010	17,419
Interest spread on funds provided		3,285	5,562		7,037	10,718
Net interest income (loss)		122,294	153,161		247,481	295,576
(Reversal of) provision for loan losses		6,948	8,440		11,204	12,721
Depreciation, amortization and accretion	[1]	(6,054)	(1,286)	[2]	(16,531)	(4,614)	[2]
Goodwill		112,226	104,304		112,226	104,304
Segment pre-tax profit (loss)		97,269	77,844	[2]	190,444	154,769	[2]
Segment assets		16,141,368	14,177,634	[2]	16,141,368	14,177,634	[2]
Other
Segment Reporting Information
Interest income		15,379	12,770		32,409	31,142
Charge for funds used		(13,723)	(9,929)		(23,168)	(14,312)
Interest spread on funds used		1,656	2,841		9,241	16,830
Interest expense		(10,247)	(12,621)		(21,305)	(25,837)
Credit on funds provided		4,463	4,942		8,874	8,809
Interest spread on funds provided		(5,784)	(7,679)		(12,431)	(17,028)
Net interest income (loss)		(4,128)	(4,838)		(3,190)	(198)
Depreciation, amortization and accretion	[1]	8,938	12,148	[2]	21,860	21,968	[2]
Segment pre-tax profit (loss)		(8,197)	(3,817)	[2]	(7,481)	(8,995)	[2]
Segment assets		$ 6,549,063	$ 5,557,346	[2]	$ 6,549,063	$ 5,557,346	[2]

[1] Includes amortization and accretion related to the FDIC indemnification asset.

[2] Prior periods were 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. See Note 10 of the Notes to Consolidated Financial Statements for additional information.