BUSINESS SEGMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information
Interest income	$ 294,442	$ 255,353	$ 580,615	$ 493,776
Charge for funds used	(68,064)	(45,628)	(128,560)	(84,412)
Interest spread on funds used	226,378	209,725	452,055	409,364
Interest expense	(27,992)	(27,709)	(56,199)	(56,841)
Credit on funds provided	68,064	45,628	128,560	84,412
Interest spread on funds provided	40,072	17,919	72,361	27,571
Net interest income (loss)	266,450	227,644	524,416	436,935
Provision for loan losses	8,000	9,000	14,933	13,327
Depreciation, amortization and accretion	22,318	23,912	35,854	38,909
Goodwill	458,467	337,438	458,467	337,438	337,438
Segment pre-tax profit (loss)	115,606	111,870	227,296	218,380
Segment assets	27,557,105	23,308,406	27,557,105	23,308,406	24,730,068
Retail Banking
Segment Reporting Information
Interest income	99,792	93,928	198,517	176,767
Charge for funds used	(23,854)	(17,901)	(48,150)	(37,885)
Interest spread on funds used	75,938	76,027	150,367	138,882
Interest expense	(11,950)	(11,708)	(23,661)	(24,353)
Credit on funds provided	54,139	36,022	102,332	68,418
Interest spread on funds provided	42,189	24,314	78,671	44,065
Net interest income (loss)	118,127	100,341	229,038	182,947
Provision for loan losses	(440)	2,886	2,212	6,566
Depreciation, amortization and accretion	4,096	5,865	6,667	8,286
Goodwill	354,163	320,566	354,163	320,566
Segment pre-tax profit (loss)	45,691	32,493	88,022	51,420
Segment assets	7,822,020	7,035,908	7,822,020	7,035,908
Commercial Banking
Segment Reporting Information
Interest income	181,880	147,168	350,956	287,228
Charge for funds used	(34,281)	(27,883)	(66,098)	(55,956)
Interest spread on funds used	147,599	119,285	284,858	231,272
Interest expense	(3,421)	(3,940)	(6,701)	(8,317)
Credit on funds provided	8,983	5,711	17,419	9,334
Interest spread on funds provided	5,562	1,771	10,718	1,017
Net interest income (loss)	153,161	121,056	295,576	232,289
Provision for loan losses	8,440	6,114	12,721	6,761
Depreciation, amortization and accretion	(1,286)	3,445	(4,614)	626
Goodwill	104,304	16,872	104,304	16,872
Segment pre-tax profit (loss)	73,987	65,514	148,718	132,195
Segment assets	14,177,634	10,903,753	14,177,634	10,903,753
Other
Segment Reporting Information
Interest income	12,770	14,257	31,142	29,781
Charge for funds used	(9,929)	156	(14,312)	9,429
Interest spread on funds used	2,841	14,413	16,830	39,210
Interest expense	(12,621)	(12,061)	(25,837)	(24,171)
Credit on funds provided	4,942	3,895	8,809	6,660
Interest spread on funds provided	(7,679)	(8,166)	(17,028)	(17,511)
Net interest income (loss)	(4,838)	6,247	(198)	21,699
Depreciation, amortization and accretion	19,508	14,602	33,801	29,997
Segment pre-tax profit (loss)	(4,072)	13,863	(9,444)	34,765
Segment assets	$ 5,557,451	$ 5,368,745	$ 5,557,451	$ 5,368,745