LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 4) - Loans Receivable - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Nonaccrual and Past Due Loans
Number of days beyond loan classified nonaccrual	90 days
Total loans	$ 24,724,591	$ 23,659,761
CRE
Nonaccrual and Past Due Loans
Total loans	8,515,079	8,110,749
CRE | Income producing
Nonaccrual and Past Due Loans
Total loans	7,780,775	7,478,474
CRE | Construction
Nonaccrual and Past Due Loans
Total loans	600,803	438,671
CRE | Land
Nonaccrual and Past Due Loans
Total loans	133,501	193,604
C&I
Nonaccrual and Past Due Loans
Total loans	9,358,045	9,003,007
C&I | Commercial business
Nonaccrual and Past Due Loans
Total loans	8,683,442	8,213,897
C&I | Trade finance
Nonaccrual and Past Due Loans
Total loans	674,603	789,110
Residential
Nonaccrual and Past Due Loans
Total loans	4,771,993	4,589,914
Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total loans	3,351,867	3,066,919
Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total loans	1,420,126	1,522,995
Consumer
Nonaccrual and Past Due Loans
Total loans	2,079,474	1,956,091
Non-PCI Loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	33,758	53,194
Total Nonaccrual Loans	121,876	121,369
Current Accruing Loans	23,851,376	22,514,444
Total loans	24,007,010	22,689,007
Non-PCI Loans | CRE
Nonaccrual and Past Due Loans
Total loans	8,119,569	7,561,384
Non-PCI Loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,029	28,721
Total Nonaccrual Loans	29,084	29,229
Current Accruing Loans	7,357,664	6,879,249
Total loans	7,387,777	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	600,803	436,762
Total loans	600,803	436,776
Non-PCI Loans | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	1,124
Total Nonaccrual Loans	5,716	683
Current Accruing Loans	125,273	185,602
Total loans	130,989	187,409
Non-PCI Loans | C&I
Nonaccrual and Past Due Loans
Total loans	9,315,160	8,943,791
Non-PCI Loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	16,538	3,177
Total Nonaccrual Loans	62,297	64,735
Current Accruing Loans	8,561,734	8,088,079
Total loans	8,640,569	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	1,936	0
Current Accruing Loans	672,655	787,800
Total loans	674,591	787,800
Non-PCI Loans | Residential
Nonaccrual and Past Due Loans
Total loans	4,513,103	4,252,004
Non-PCI Loans | Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	8,673	10,584
Total Nonaccrual Loans	5,785	8,726
Current Accruing Loans	3,186,787	2,857,976
Total loans	3,201,245	2,877,286
Non-PCI Loans | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,024	7,301
Total Nonaccrual Loans	13,547	16,244
Current Accruing Loans	1,293,287	1,351,173
Total loans	1,311,858	1,374,718
Non-PCI Loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,494	2,287
Total Nonaccrual Loans	3,511	1,738
Current Accruing Loans	2,053,173	1,927,803
Total loans	2,059,178	1,931,828
Non-PCI Loans | Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	25,932	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	99	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	0	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	12,667	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 | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,116	7,657
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	4,642	6,320
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,408	2,078
Non-PCI Loans | Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,826	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	930	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	0	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	3,871	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 | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,557	2,927
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	382	981
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,086	209
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	75,550	69,187
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	16,164	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	5,706	277
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	44,514	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	0	0
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	2,302	92
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	6,743	6,486
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	121	233
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	46,326	52,182
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	12,920	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	10	406
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	17,783	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	1,936	0
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	3,483	8,634
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	6,804	9,758
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 3,390	$ 1,505