LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 3) - Loans Receivable - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Nonaccrual and Past Due Loans
Total loans	$ 22,658,908	$ 21,727,145
Unearned fees, premiums and discounts, net	$ (13,176)	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	$ 7,710,004	6,819,513
CRE | Income producing
Nonaccrual and Past Due Loans
Total loans	7,088,408	6,256,059
CRE | Construction
Nonaccrual and Past Due Loans
Total loans	436,197	332,287
CRE | Land
Nonaccrual and Past Due Loans
Total loans	185,399	231,167
C&I
Nonaccrual and Past Due Loans
Total loans	8,619,156	8,077,201
C&I | Commercial business
Nonaccrual and Past Due Loans
Total loans	7,801,129	7,181,189
C&I | Trade finance
Nonaccrual and Past Due Loans
Total loans	818,027	896,012
Residential
Nonaccrual and Past Due Loans
Total loans	4,495,169	5,316,689
Residential | Single-family
Nonaccrual and Past Due Loans
Total loans	3,002,808	3,866,781
Residential | Multifamily
Nonaccrual and Past Due Loans
Total loans	1,492,361	1,449,908
Consumer
Nonaccrual and Past Due Loans
Total loans	1,834,579	1,513,742
Non-PCI loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	87,975	40,235
Total Nonaccrual Loans	117,519	100,262
Current Accruing Loans	21,403,409	20,264,535
Total loans	21,608,903	20,405,032
Unearned fees, premiums and discounts, net	(13,176)	2,804
Total recorded investment in non-PCI loans	21,595,727	20,407,836
Non-PCI loans | CRE
Nonaccrual and Past Due Loans
Total loans	7,126,445	6,102,216
Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	24,734	17,764
Total Nonaccrual Loans	29,639	28,513
Current Accruing Loans	6,463,679	5,521,769
Total loans	6,518,052	5,568,046
Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	11	0
Total Nonaccrual Loans	759	6,913
Current Accruing Loans	428,647	312,930
Total loans	429,417	319,843
Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	9,739	0
Total Nonaccrual Loans	1,696	2,723
Current Accruing Loans	167,541	211,604
Total loans	178,976	214,327
Non-PCI loans | C&I
Nonaccrual and Past Due Loans
Total loans	8,553,540	7,987,581
Non-PCI loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	29,880	7,548
Total Nonaccrual Loans	60,703	28,436
Current Accruing Loans	7,649,246	7,061,869
Total loans	7,739,829	7,097,853
Non-PCI loans | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	0	365
Current Accruing Loans	813,711	889,363
Total loans	813,711	889,728
Non-PCI loans | Residential
Nonaccrual and Past Due Loans
Total loans	4,119,399	4,831,279
Non-PCI loans | Residential | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	10,544	7,675
Total Nonaccrual Loans	11,067	8,625
Current Accruing Loans	2,785,637	3,630,962
Total loans	2,807,248	3,647,262
Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	12,262	4,932
Total Nonaccrual Loans	13,127	20,819
Current Accruing Loans	1,286,762	1,158,266
Total loans	1,312,151	1,184,017
Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	805	2,316
Total Nonaccrual Loans	528	3,868
Current Accruing Loans	1,808,186	1,477,772
Total loans	1,809,519	1,483,956
Accruing Loans 30-59 Days Past Due | Non-PCI loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	54,958	30,318
Accruing Loans 30-59 Days Past Due | Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	12,964	14,171
Accruing Loans 30-59 Days Past Due | Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Accruing Loans 30-59 Days Past Due | Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Accruing Loans 30-59 Days Past Due | Non-PCI loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	29,143	3,187
Accruing Loans 30-59 Days Past Due | Non-PCI loans | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Accruing Loans 30-59 Days Past Due | Non-PCI loans | Residential | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,053	6,381
Accruing Loans 30-59 Days Past Due | Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,107	4,425
Accruing Loans 30-59 Days Past Due | Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	691	2,154
Accruing Loans 60-89 Days Past Due | Non-PCI loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	33,017	9,917
Accruing Loans 60-89 Days Past Due | Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	11,770	3,593
Accruing Loans 60-89 Days Past Due | Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	11	0
Accruing Loans 60-89 Days Past Due | Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	9,739	0
Accruing Loans 60-89 Days Past Due | Non-PCI loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	737	4,361
Accruing Loans 60-89 Days Past Due | Non-PCI loans | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Accruing Loans 60-89 Days Past Due | Non-PCI loans | Residential | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,491	1,294
Accruing Loans 60-89 Days Past Due | Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,155	507
Accruing Loans 60-89 Days Past Due | Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	114	162
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	63,668	41,770
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	10,817	19,348
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	14	15
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	1,081	221
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	43,574	6,623
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	73
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | Residential | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	99	2,861
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	7,922	12,460
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	161	169
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	53,851	58,492
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	18,822	9,165
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	745	6,898
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	615	2,502
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	17,129	21,813
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	292
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | Residential | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	10,968	5,764
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	5,205	8,359
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 367	$ 3,699