ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), cash flow hedge derivative financial instruments, beginning balance	$ (31,663)		$ (68,345)		$ (39,423)		$ (79,174)
Change in accumulated gains (losses) on cash flow hedge derivative financial instruments, pretax activity	(15,472)		6,457		(17,120)		7,926
Change in accumulated gains (losses) on cash flow hedge derivative financial instruments, tax effect	5,228		(2,568)		6,133		(3,194)
Change in accumulated gains (losses) on cash flow hedge derivative financial instruments, net activity	(10,244)		3,889		(10,987)		4,732
Reclassification adjustment for net losses on cash flow hedge derivative financial instruments, pretax activity	13,782	[1]	17,160		27,467	[1]	34,561
Reclassification adjustment for net losses on cash flow hedge derivative financial instruments, tax effect	(4,657)	[1]	(6,824)		(9,839)	[1]	(14,239)
Reclassification adjustment for net losses on cash flow hedge derivative financial instruments, net activity	9,125	[1]	10,336		17,628	[1]	20,322
Net unrealized gains (losses) on cash flow hedge derivative financial instruments, pretax activity	(1,690)		23,617		10,347		42,487
Net unrealized gains (losses) on cash flow hedge derivative financial instruments, tax effect	571		(9,392)		(3,706)		(17,433)
Net unrealized gains (losses) on cash flow hedge derivative financial instruments, net activity	(1,119)		14,225		6,641		25,054
Accumulated other comprehensive income (loss), cash flow hedge derivative financial instruments, ending balance	(32,782)		(54,120)		(32,782)		(54,120)
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), investment securities available-for-sale, beginning balance	(116,531)		96,085		(199,392)		160,224
Change in unrealized gains/(losses) on investment securities available-for-sale, pretax activity	85,291		(383,087)		2,651,973		(415,895)
Change in unrealized gains/(losses) on investment securities available-for-sale, tax effect	(33,447)		149,370		(1,039,069)		162,388
Change in unrealized gains/(losses) on investment securities available-for-sale, net activity	51,844		(233,717)		1,612,904		(253,507)
Reclassification adjustment for net gains (losses) included in net income on non-OTTI securities, pretax activity	(9,405)	[2]	(22,673)	[2]	(2,439,888)	[2]	(96,195)	[2]
Reclassification adjustment for net gains (losses) included in net income on non-OTTI securities, tax effect	3,688	[2]	8,841	[2]	955,972	[2]	38,014	[2]
Reclassification adjustment for net gains (losses) included in net income on non-OTTI securities, net activity	(5,717)	[2]	(13,832)	[2]	(1,483,916)	[2]	(58,181)	[2]
Reclassification adjustment for net gains included in net income on OTTI securities, pretax activity			63,630	[3]			63,630	[3]
Reclassification adjustment for net gains included in net income on OTTI securities, tax effect			(24,810)	[3]			(24,810)	[3]
Reclassification adjustment for net gains included in net income on OTTI securities, net activity			38,820	[3]			38,820	[3]
Total reclassification adjustment for net gains included in net income, pretax activity			40,957				(32,565)
Total reclassification adjustment for net gains included in net income, tax effect			(15,969)				13,204
Total reclassification adjustment for net gains included in net income, net activity			24,988				(19,361)
Net unrealized gains/(losses) on investment securities available-for-sale, pretax activity	75,886		(342,130)		212,085		(448,460)
Net unrealized gains/(losses) on investment securities available-for-sale, tax effect	(29,759)		133,401		(83,097)		175,592
Net unrealized gains/(losses) on investment securities available-for-sale, net activity	46,127		(208,729)		128,988		(272,868)
Accumulated other comprehensive income (loss), investment securities available-for-sale, ending balance	(70,404)		(112,644)		(70,404)		(112,644)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), defined benefit plans, beginning balance	(14,991)	[3]	(26,167)		(15,553)	[3]	(26,716)
Pension and post-retirement actuarial gain/(loss), pretax activity	447	[3]	904		894	[3]	1,808
Pension and post-retirement actuarial gain/(loss), tax effect	(174)	[3]	(355)		(59)	[3]	(710)
Pension and post-retirement actuarial gain/(loss), net activity	273	[3]	549		835	[3]	1,098
Accumulated other comprehensive income (loss), defined benefit plans, ending balance	(14,718)	[3]	(25,618)		(14,718)	[3]	(25,618)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	(163,185)		1,573		(254,368)		54,334
Other comprehensive income (loss), pretax activity	74,643		(317,609)		223,326		(404,165)
Other comprehensive income (loss), tax effect	(29,362)		123,654		(86,862)		157,449
TOTAL OTHER COMPREHENSIVE (LOSS)/INCOME	45,281		(193,955)		136,464		(246,716)
Accumulated other comprehensive income (loss), ending balance	$ (117,904)		$ (192,382)		$ (117,904)		$ (192,382)

[1] Net losses reclassified into Interest on borrowings and other debt obligations in the Condensed Consolidated Statement of Operations for settlements of interest rate swap contracts designated as cash flow hedges.

[2] Net gains reclassified into Net gain on sale of investment securities sales in the Condensed Consolidated Statement of Operations for the sale of available-for-sale securities.

[3] Included in the computation of net periodic pension costs.