NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 5) (Non-covered loans, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 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	$ 30,765	[1]	$ 30,282
Accruing loans 60 - 89 days past due	8,615	[1]	9,956
Total accruing past due loans	39,380	[1]	40,238
Nonaccrual loans less than 90 days past due	50,886	[1]	40,462
Nonaccrual loans 90 or more days past due	50,157	[1]	71,189
Total nonaccrual past due loans	101,043	[1]	111,651
Current Accruing loans	20,154,978	[1]	15,731,398
Total non-covered loans and loans held for sale, gross	20,295,401	[1]	15,883,287
Unearned fees, premiums and discounts, net	2,804		(23,672)
Recorded investment in non-covered loans and loans held for sale	20,298,205		15,859,615
Loans Held for Sale
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	642
Accruing loans 60 - 89 days past due	175
Total accruing past due loans	817
Nonaccrual loans less than 90 days past due	0
Nonaccrual loans 90 or more days past due	3,157
Total nonaccrual past due loans	3,157
Current Accruing loans	41,976		204,970
Total non-covered loans and loans held for sale, gross	45,950		204,970
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 past due loans	6,888		6,888
Current Accruing loans	306,923		133,298
Total non-covered loans and loans held for sale, gross	313,811		140,186
CRE | Land
Aging analysis of past Due non-covered loans and loans held for sale
Nonaccrual loans less than 90 days past due	254		265
Nonaccrual loans 90 or more days past due	2,502		3,223
Total nonaccrual past due loans	2,756		3,488
Current Accruing loans	205,994		140,373
Total non-covered loans and loans held for sale, gross	208,750		143,861
CRE | Income producing
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	14,171		12,746
Accruing loans 60 - 89 days past due	3,593		1,798
Total accruing past due loans	17,764		14,544
Nonaccrual loans less than 90 days past due	29,576		13,924
Nonaccrual loans 90 or more days past due	9,109		22,549
Total nonaccrual past due loans	38,685		36,473
Current Accruing loans	5,555,036		4,250,013
Total non-covered loans and loans held for sale, gross	5,611,485		4,301,030
C&I | Commercial business
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	3,073		3,428
Accruing loans 60 - 89 days past due	2,884		6,259
Total accruing past due loans	5,957		9,687
Nonaccrual loans less than 90 days past due	5,514		6,437
Nonaccrual loans 90 or more days past due	14,689		15,486
Total nonaccrual past due loans	20,203		21,923
Current Accruing loans	7,005,190		4,605,446
Total non-covered loans and loans held for sale, gross	7,031,350		4,637,056
C&I | Trade finance
Aging analysis of past Due non-covered loans and loans held for sale
Nonaccrual loans less than 90 days past due	73
Nonaccrual loans 90 or more days past due			909
Total nonaccrual past due loans	73		909
Current Accruing loans	806,671		722,228
Total non-covered loans and loans held for sale, gross	806,744		723,137
Residential | Single-family
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	6,375		4,694
Accruing loans 60 - 89 days past due	1,294		922
Total accruing past due loans	7,669		5,616
Nonaccrual loans less than 90 days past due	2,894
Nonaccrual loans 90 or more days past due	4,936		11,218
Total nonaccrual past due loans	7,830		11,218
Current Accruing loans	3,627,479		3,176,041
Total non-covered loans and loans held for sale, gross	3,642,978		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	4,350		8,580
Accruing loans 60 - 89 days past due	507		531
Total accruing past due loans	4,857		9,111
Nonaccrual loans less than 90 days past due	12,460		19,661
Nonaccrual loans 90 or more days past due	8,336		7,972
Total nonaccrual past due loans	20,796		27,633
Current Accruing loans	1,152,037		955,690
Total non-covered loans and loans held for sale, gross	1,177,690		992,434
Consumer | Student loans
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due			541
Accruing loans 60 - 89 days past due			445
Total accruing past due loans			986
Nonaccrual loans 90 or more days past due			1,681
Total nonaccrual past due loans			1,681
Current Accruing loans			676,553
Total non-covered loans and loans held for sale, gross			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	2,154		293
Accruing loans 60 - 89 days past due	162		1
Total accruing past due loans	2,316		294
Nonaccrual loans less than 90 days past due	115		175
Nonaccrual loans 90 or more days past due	540		1,263
Total nonaccrual past due loans	655		1,438
Current Accruing loans	1,453,672		866,786
Total non-covered loans and loans held for sale, gross	$ 1,456,643		$ 868,518

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