NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 5) (Non-covered loans, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
Aging analysis of past Due non-covered loans and loans held for sale
Number of days a loan is past due and is placed on nonaccrual status	90 days
Accruing loans 30 - 59 days past due	$ 62,473	[1]	$ 30,282
Accruing loans 60 - 89 days past due	18,617	[1]	9,956
Total accruing past due loans	81,090	[1]	40,238
Nonaccrual loans less than 90 days past due	51,146	[1]	40,462
Nonaccrual loans 90 or more days past due	74,574	[1]	71,189
Total nonaccrual loans	125,720	[1]	111,651
Current Accruing loans	19,384,395	[1]	15,731,398
Total non-covered loans and loans held for sale, gross	19,591,205	[1]	15,883,287
Unearned fees, premiums and discounts, net	(5,171)		(23,672)
Recorded investment in non-covered loans and loans held for sale	19,586,034		15,859,615
Loans Held for Sale
Aging analysis of past Due non-covered loans and loans held for sale
Current Accruing loans	239,649		204,970
Total non-covered loans and loans held for sale, gross	239,649		204,970
Residential | Single-family
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	5,916		4,694
Accruing loans 60 - 89 days past due	1,502		922
Total accruing past due loans	7,418		5,616
Nonaccrual loans less than 90 days past due	2,839
Nonaccrual loans 90 or more days past due	7,899		11,218
Total nonaccrual loans	10,738		11,218
Current Accruing loans	3,454,569		3,176,041
Total non-covered loans and loans held for sale, gross	3,472,725		3,192,875
Residential | Multifamily
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	6,166		8,580
Accruing loans 60 - 89 days past due			531
Total accruing past due loans	6,166		9,111
Nonaccrual loans less than 90 days past due	12,110		19,661
Nonaccrual loans 90 or more days past due	12,690		7,972
Total nonaccrual loans	24,800		27,633
Current Accruing loans	1,145,604		955,690
Total non-covered loans and loans held for sale, gross	1,176,570		992,434
Commercial Real Estate ("CRE") | Income producing
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	14,900		12,746
Accruing loans 60 - 89 days past due	11,044		1,798
Total accruing past due loans	25,944		14,544
Nonaccrual loans less than 90 days past due	27,719		13,924
Nonaccrual loans 90 or more days past due	21,058		22,549
Total nonaccrual loans	48,777		36,473
Current Accruing loans	5,388,488		4,250,013
Total non-covered loans and loans held for sale, gross	5,463,209		4,301,030
Commercial Real Estate ("CRE") | Construction
Aging analysis of past Due non-covered loans and loans held for sale
Nonaccrual loans 90 or more days past due	6,888		6,888
Total nonaccrual loans	6,888		6,888
Current Accruing loans	280,453		133,298
Total non-covered loans and loans held for sale, gross	287,341		140,186
Commercial Real Estate ("CRE") | Land
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	1,119
Total accruing past due loans	1,119
Nonaccrual loans less than 90 days past due	1,266		265
Nonaccrual loans 90 or more days past due	2,513		3,223
Total nonaccrual loans	3,779		3,488
Current Accruing loans	193,902		140,373
Total non-covered loans and loans held for sale, gross	198,800		143,861
Commercial and Industrial ("C&I") | Commercial Business
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	29,696		3,428
Accruing loans 60 - 89 days past due	4,474		6,259
Total accruing past due loans	34,170		9,687
Nonaccrual loans less than 90 days past due	6,983		6,437
Nonaccrual loans 90 or more days past due	19,794		15,486
Total nonaccrual loans	26,777		21,923
Current Accruing loans	6,478,693		4,605,446
Total non-covered loans and loans held for sale, gross	6,539,640		4,637,056
Commercial and Industrial ("C&I") | Trade finance
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	750
Total accruing past due loans	750
Nonaccrual loans less than 90 days past due	111
Nonaccrual loans 90 or more days past due	32		909
Total nonaccrual loans	143		909
Current Accruing loans	743,125		722,228
Total non-covered loans and loans held for sale, gross	744,018		723,137
Consumer | Student loans
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	1,350		541
Accruing loans 60 - 89 days past due	1,048		445
Total accruing past due loans	2,398		986
Nonaccrual loans 90 or more days past due	3,310		1,681
Total nonaccrual loans	3,310		1,681
Current Accruing loans	87,471		676,553
Total non-covered loans and loans held for sale, gross	93,179		679,220
Consumer | Other Consumer
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	2,576		293
Accruing loans 60 - 89 days past due	549		1
Total accruing past due loans	3,125		294
Nonaccrual loans less than 90 days past due	118		175
Nonaccrual loans 90 or more days past due	390		1,263
Total nonaccrual loans	508		1,438
Current Accruing loans	1,372,441		866,786
Total non-covered loans and loans held for sale, gross	$ 1,376,074		$ 868,518

[1] Loans net of ASC 310-30 discount.