SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	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
Segment Reporting Information
Interest income	$ 293,203	$ 281,706	$ 255,353	$ 238,423	$ 276,521	$ 254,162	$ 266,362	$ 254,050	$ 1,068,685		$ 1,051,095		$ 1,080,448
Charge for funds used									(220,957)		(160,092)		(232,464)
Interest spread on funds used									847,728		891,003		847,984
Interest expense	(28,195)	(27,456)	(27,709)	(29,132)	(31,577)	(32,254)	(33,205)	(35,132)	(112,492)		(132,168)		(177,422)
Credit on funds provided									220,957		160,092		232,464
Interest spread on funds provided									108,465		27,924		55,042
Net interest income	265,008	254,250	227,644	209,291	244,944	221,908	233,157	218,918	956,193		918,927		903,026
Provision for loan losses									22,364		65,184		95,006
Depreciation, amortization and accretion									97,110	[1]	43,751	[1]	128,254	[1]
Goodwill	337,438				337,438				337,438		337,438		337,438
Segment pre-tax profit	98,564	108,906	111,870	106,510	108,200	105,203	104,394	107,795	425,850		425,592		383,334
Segment assets	24,730,068				22,536,110				24,730,068		22,536,110		21,968,667
Retail Banking
Segment Reporting Information
Interest income									374,818		356,244		358,853
Charge for funds used									(86,552)		(85,811)		(94,098)
Interest spread on funds used									288,266		270,433		264,755
Interest expense									(47,287)		(57,401)		(85,356)
Credit on funds provided									173,194		130,713		202,080
Interest spread on funds provided									125,907		73,312		116,724
Net interest income									414,173		343,745		381,479
Provision for loan losses									10,911		28,729		27,888
Depreciation, amortization and accretion									19,865	[1]	12,869	[1]	43,899	[1]
Goodwill	320,566				320,566				320,566		320,566		320,566
Segment pre-tax profit									123,876		74,836		102,217
Segment assets	7,820,191				6,552,217				7,820,191		6,552,217		6,530,138
Commercial Banking
Segment Reporting Information
Interest income									627,118		617,041		619,766
Charge for funds used									(116,161)		(118,688)		(142,056)
Interest spread on funds used									510,957		498,353		477,710
Interest expense									(15,185)		(23,226)		(31,407)
Credit on funds provided									29,262		13,138		13,863
Interest spread on funds provided									14,077		(10,088)		(17,544)
Net interest income									525,034		488,265		460,166
Provision for loan losses									11,453		36,455		67,118
Depreciation, amortization and accretion									8,120	[1]	(13,277)	[1]	62,803	[1]
Goodwill	16,872				16,872				16,872		16,872		16,872
Segment pre-tax profit									272,369		266,168		227,766
Segment assets	11,545,405				10,421,160				11,545,405		10,421,160		10,157,195
Other
Segment Reporting Information
Interest income									66,749		77,810		101,829
Charge for funds used									(18,244)		44,407		3,690
Interest spread on funds used									48,505		122,217		105,519
Interest expense									(50,020)		(51,541)		(60,659)
Credit on funds provided									18,501		16,241		16,521
Interest spread on funds provided									(31,519)		(35,300)		(44,138)
Net interest income									16,986		86,917		61,381
Depreciation, amortization and accretion									69,125	[1]	44,159	[1]	21,552	[1]
Segment pre-tax profit									29,605		84,588		53,351
Segment assets	$ 5,364,472				$ 5,562,733				$ 5,364,472		$ 5,562,733		$ 5,281,334

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