BUSINESS SEGMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information
Interest income	$ 285,948	$ 281,706	$ 866,563	$ 775,482
Charge for funds used	(75,812)	(67,862)	(204,373)	(152,274)
Interest spread on funds used	210,136	213,844	662,190	623,208
Interest expense	(28,974)	(27,456)	(85,173)	(84,297)
Credit on funds provided	75,812	67,862	204,373	152,274
Interest spread on funds provided	46,838	40,406	119,200	67,977
Net interest income (loss)	256,974	254,250	781,390	691,185
Provision for loan losses	15,225	3,571	30,158	16,898
Depreciation, amortization and accretion	49,080	22,158	84,934	61,067
Goodwill	458,467	337,438	458,467	337,438	337,438
Segment pre-tax profit	75,112	108,906	302,408	327,286
Segment assets	28,481,130	24,498,835	28,481,130	24,498,835	24,730,068
Retail Banking
Segment Reporting Information
Interest income	95,911	97,488	294,428	274,255
Charge for funds used	(24,738)	(23,351)	(72,888)	(61,236)
Interest spread on funds used	71,173	74,137	221,540	213,019
Interest expense	(12,057)	(11,570)	(35,718)	(35,923)
Credit on funds provided	60,770	52,257	163,102	120,675
Interest spread on funds provided	48,713	40,687	127,384	84,752
Net interest income (loss)	119,886	114,824	348,924	297,771
Provision for loan losses	394	1,168	2,606	7,734
Depreciation, amortization and accretion	4,806	5,214	11,473	13,500
Goodwill	354,163	320,566	354,163	320,566
Segment pre-tax profit	39,872	36,498	127,893	87,918
Segment assets	7,775,343	7,523,832	7,775,343	7,523,832
Commercial Banking
Segment Reporting Information
Interest income	175,032	166,442	525,987	453,670
Charge for funds used	(35,809)	(29,241)	(101,907)	(85,197)
Interest spread on funds used	139,223	137,201	424,080	368,473
Interest expense	(4,692)	(3,456)	(11,393)	(11,773)
Credit on funds provided	9,908	9,803	27,328	19,137
Interest spread on funds provided	5,216	6,347	15,935	7,364
Net interest income (loss)	144,439	143,548	440,015	375,837
Provision for loan losses	14,831	2,403	27,552	9,164
Depreciation, amortization and accretion	(412)	1,911	(5,026)	2,537
Goodwill	104,304	16,872	104,304	16,872
Segment pre-tax profit	43,833	76,255	192,551	208,450
Segment assets	14,879,699	11,145,584	14,879,699	11,145,584
Other
Segment Reporting Information
Interest income	15,005	17,776	46,148	47,557
Charge for funds used	(15,265)	(15,270)	(29,578)	(5,841)
Interest spread on funds used	(260)	2,506	16,570	41,716
Interest expense	(12,225)	(12,430)	(38,062)	(36,601)
Credit on funds provided	5,134	5,802	13,943	12,462
Interest spread on funds provided	(7,091)	(6,628)	(24,119)	(24,139)
Net interest income (loss)	(7,351)	(4,122)	(7,549)	17,577
Depreciation, amortization and accretion	44,686	15,033	78,487	45,030
Segment pre-tax profit	(8,593)	(3,847)	(18,036)	30,918
Segment assets	$ 5,826,088	$ 5,829,419	$ 5,826,088	$ 5,829,419