LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES (Details 3) - Loans Receivable - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Nonaccrual and Past Due Loans
Total loans	[1]	$ 21,964,612	$ 21,727,145
Unearned fees, premiums and discounts, net		$ (5,948)	2,804
Number of days a loan is past due and is placed on nonaccrual status		90 days
CRE
Nonaccrual and Past Due Loans
Total loans	[1]	$ 7,286,873	6,819,513
CRE | Income producing
Nonaccrual and Past Due Loans
Total loans	[1]	6,714,165	6,256,059
CRE | Construction
Nonaccrual and Past Due Loans
Total loans	[1]	377,774	332,287
CRE | Land
Nonaccrual and Past Due Loans
Total loans	[1]	194,934	231,167
C&I
Nonaccrual and Past Due Loans
Total loans	[1]	8,150,664	8,077,201
C&I | Commercial business
Nonaccrual and Past Due Loans
Total loans	[1]	7,377,605	7,181,189
C&I | Trade finance
Nonaccrual and Past Due Loans
Total loans	[1]	773,059	896,012
Residential
Nonaccrual and Past Due Loans
Total loans	[1]	4,797,632	5,316,689
Residential | Single-family
Nonaccrual and Past Due Loans
Total loans	[1]	3,323,152	3,866,781
Residential | Multifamily
Nonaccrual and Past Due Loans
Total loans	[1]	1,474,480	1,449,908
Consumer
Nonaccrual and Past Due Loans
Total loans	[1]	1,729,443	1,513,742
Non-PCI loans
Nonaccrual and Past Due Loans
Accruing loans 30 - 59 days past due		34,782	30,318
Accruing loans 60 - 89 days past due		22,786	9,917
Total accruing past due loans		57,568	40,235
Nonaccrual loans less than 90 days past due		39,100	41,770
Nonaccrual loans 90 or more days past due		48,057	58,492
Total nonaccrual loans		87,157	100,262
Current accruing loans		20,648,085	20,264,535
Total loans		20,792,810	20,405,032
Unearned fees, premiums and discounts, net		(5,948)	2,804
Total recorded investment in non-PCI loans		20,786,862	20,407,836
Non-PCI loans | CRE
Nonaccrual and Past Due Loans
Total loans		6,640,321	6,102,216
Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Accruing loans 30 - 59 days past due		6,761	14,171
Accruing loans 60 - 89 days past due		3,762	3,593
Total accruing past due loans		10,523	17,764
Nonaccrual loans less than 90 days past due		18,858	19,348
Nonaccrual loans 90 or more days past due		12,193	9,165
Total nonaccrual loans		31,051	28,513
Current accruing loans		6,046,087	5,521,769
Total loans		6,087,661	5,568,046
Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Accruing loans 30 - 59 days past due		4,982
Total accruing past due loans		4,982
Nonaccrual loans less than 90 days past due		14	15
Nonaccrual loans 90 or more days past due			6,898
Total nonaccrual loans		14	6,913
Current accruing loans		365,327	312,930
Total loans		370,323	319,843
Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Accruing loans 30 - 59 days past due		5,701
Total accruing past due loans		5,701
Nonaccrual loans less than 90 days past due		308	221
Nonaccrual loans 90 or more days past due		4,743	2,502
Total nonaccrual loans		5,051	2,723
Current accruing loans		171,585	211,604
Total loans		182,337	214,327
Non-PCI loans | C&I
Nonaccrual and Past Due Loans
Total loans		8,079,552	7,987,581
Non-PCI loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Accruing loans 30 - 59 days past due		2,973	3,187
Accruing loans 60 - 89 days past due		11,429	4,361
Total accruing past due loans		14,402	7,548
Nonaccrual loans less than 90 days past due		6,987	6,623
Nonaccrual loans 90 or more days past due		23,508	21,813
Total nonaccrual loans		30,495	28,436
Current accruing loans		7,266,376	7,061,869
Total loans		7,311,273	7,097,853
Non-PCI loans | C&I | Trade finance
Nonaccrual and Past Due Loans
Accruing loans 30 - 59 days past due		2,500
Accruing loans 60 - 89 days past due		470
Total accruing past due loans		2,970
Nonaccrual loans less than 90 days past due			73
Nonaccrual loans 90 or more days past due			292
Total nonaccrual loans			365
Current accruing loans		765,309	889,363
Total loans		768,279	889,728
Non-PCI loans | Residential
Nonaccrual and Past Due Loans
Total loans		4,370,115	4,831,279
Non-PCI loans | Residential | Single-family
Nonaccrual and Past Due Loans
Accruing loans 30 - 59 days past due		8,081	6,381
Accruing loans 60 - 89 days past due		4,167	1,294
Total accruing past due loans		12,248	7,675
Nonaccrual loans less than 90 days past due		2,736	2,861
Nonaccrual loans 90 or more days past due		5,713	5,764
Total nonaccrual loans		8,449	8,625
Current accruing loans		3,098,982	3,630,962
Total loans		3,119,679	3,647,262
Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Accruing loans 30 - 59 days past due		945	4,425
Accruing loans 60 - 89 days past due		1,999	507
Total accruing past due loans		2,944	4,932
Nonaccrual loans less than 90 days past due		10,034	12,460
Nonaccrual loans 90 or more days past due		1,375	8,359
Total nonaccrual loans		11,409	20,819
Current accruing loans		1,236,083	1,158,266
Total loans		1,250,436	1,184,017
Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Accruing loans 30 - 59 days past due		2,839	2,154
Accruing loans 60 - 89 days past due		959	162
Total accruing past due loans		3,798	2,316
Nonaccrual loans less than 90 days past due		163	169
Nonaccrual loans 90 or more days past due		525	3,699
Total nonaccrual loans		688	3,868
Current accruing loans		1,698,336	1,477,772
Total loans		$ 1,702,822	$ 1,483,956

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