LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 4) - Loans Receivable - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Nonaccrual and Past Due Loans
Total loans	$ 23,767,903	$ 23,659,761
Number of days a loan is past due and is placed on nonaccrual status	90 days
CRE
Nonaccrual and Past Due Loans
Total loans	$ 8,451,478	8,110,749
CRE | Income producing
Nonaccrual and Past Due Loans
Total loans	7,816,442	7,478,474
CRE | Construction
Nonaccrual and Past Due Loans
Total loans	467,103	438,671
CRE | Land
Nonaccrual and Past Due Loans
Total loans	167,933	193,604
C&I
Nonaccrual and Past Due Loans
Total loans	8,818,243	9,003,007
C&I | Commercial business
Nonaccrual and Past Due Loans
Total loans	8,053,535	8,213,897
C&I | Trade finance
Nonaccrual and Past Due Loans
Total loans	764,708	789,110
Residential
Nonaccrual and Past Due Loans
Total loans	4,451,398	4,589,914
Residential | Single-family
Nonaccrual and Past Due Loans
Total loans	3,103,391	3,066,919
Residential | Multifamily
Nonaccrual and Past Due Loans
Total loans	1,348,007	1,522,995
Consumer
Nonaccrual and Past Due Loans
Total loans	2,046,784	1,956,091
Non-PCI loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	42,823	53,194
Total Nonaccrual Loans	162,626	121,369
Current Accruing Loans	22,695,613	22,514,444
Total loans	22,901,062	22,689,007
Non-PCI loans | CRE
Nonaccrual and Past Due Loans
Total loans	7,948,825	7,561,384
Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	14,433	28,721
Total Nonaccrual Loans	52,866	29,229
Current Accruing Loans	7,250,692	6,879,249
Total loans	7,317,991	6,937,199
Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	0	14
Current Accruing Loans	465,763	436,762
Total loans	465,763	436,776
Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,970	1,124
Total Nonaccrual Loans	6,182	683
Current Accruing Loans	156,919	185,602
Total loans	165,071	187,409
Non-PCI loans | C&I
Nonaccrual and Past Due Loans
Total loans	8,764,775	8,943,791
Non-PCI loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	9,218	3,177
Total Nonaccrual Loans	64,364	64,735
Current Accruing Loans	7,927,698	8,088,079
Total loans	8,001,280	8,155,991
Non-PCI loans | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	8,375	0
Current Accruing Loans	755,120	787,800
Total loans	763,495	787,800
Non-PCI loans | Residential
Nonaccrual and Past Due Loans
Total loans	4,163,941	4,252,004
Non-PCI loans | Residential | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,800	10,584
Total Nonaccrual Loans	11,371	8,726
Current Accruing Loans	2,908,048	2,857,976
Total loans	2,927,219	2,877,286
Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,261	7,301
Total Nonaccrual Loans	14,790	16,244
Current Accruing Loans	1,214,671	1,351,173
Total loans	1,236,722	1,374,718
Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,141	2,287
Total Nonaccrual Loans	4,678	1,738
Current Accruing Loans	2,016,702	1,927,803
Total loans	2,023,521	1,931,828
Non-PCI loans | Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	28,919	22,636
Non-PCI loans | Accruing Loans 30-59 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	8,580	3,465
Non-PCI loans | Accruing Loans 30-59 Days Past Due | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI loans | Accruing Loans 30-59 Days Past Due | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,849	1,124
Non-PCI loans | Accruing Loans 30-59 Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,687	1,992
Non-PCI loans | Accruing Loans 30-59 Days Past Due | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI loans | Accruing Loans 30-59 Days Past Due | Residential | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,117	7,657
Non-PCI loans | Accruing Loans 30-59 Days Past Due | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6,164	6,320
Non-PCI loans | Accruing Loans 30-59 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,522	2,078
Non-PCI loans | Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	13,904	30,558
Non-PCI loans | Accruing Loans 60-89 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,853	25,256
Non-PCI loans | Accruing Loans 60-89 Days Past Due | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI loans | Accruing Loans 60-89 Days Past Due | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	121	0
Non-PCI loans | Accruing Loans 60-89 Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,531	1,185
Non-PCI loans | Accruing Loans 60-89 Days Past Due | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI loans | Accruing Loans 60-89 Days Past Due | Residential | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,683	2,927
Non-PCI loans | Accruing Loans 60-89 Days Past Due | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,097	981
Non-PCI loans | Accruing Loans 60-89 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	619	209
Non-PCI loans | Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	95,542	69,187
Non-PCI loans | Nonaccrual Loans Less Than 90 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	12,939	11,359
Non-PCI loans | Nonaccrual Loans Less Than 90 Days Past Due | CRE | Construction
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	14
Non-PCI loans | Nonaccrual Loans Less Than 90 Days Past Due | CRE | Land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	6,182	277
Non-PCI loans | Nonaccrual Loans Less Than 90 Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	56,380	50,726
Non-PCI loans | Nonaccrual Loans Less Than 90 Days Past Due | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	8,375	0
Non-PCI loans | Nonaccrual Loans Less Than 90 Days Past Due | Residential | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	2,521	92
Non-PCI loans | Nonaccrual Loans Less Than 90 Days Past Due | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	5,641	6,486
Non-PCI loans | Nonaccrual Loans Less Than 90 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	3,504	233
Non-PCI loans | Nonaccrual Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	67,084	52,182
Non-PCI loans | Nonaccrual Loans 90 or More Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	39,927	17,870
Non-PCI loans | Nonaccrual Loans 90 or More Days Past Due | CRE | Construction
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	0
Non-PCI loans | Nonaccrual Loans 90 or More Days Past Due | CRE | Land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	406
Non-PCI loans | Nonaccrual Loans 90 or More Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	7,984	14,009
Non-PCI loans | Nonaccrual Loans 90 or More Days Past Due | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	0
Non-PCI loans | Nonaccrual Loans 90 or More Days Past Due | Residential | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	8,850	8,634
Non-PCI loans | Nonaccrual Loans 90 or More Days Past Due | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	9,149	9,758
Non-PCI loans | Nonaccrual Loans 90 or More Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 1,174	$ 1,505