LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 4) - Loans Receivable - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Nonaccrual and Past Due Loans
Total loans	$ 25,503,139	$ 23,643,748
CRE
Nonaccrual and Past Due Loans
Total loans	8,690,863	8,100,072
CRE | Income producing
Nonaccrual and Past Due Loans
Total loans	8,016,109	7,471,812
CRE | Construction
Nonaccrual and Past Due Loans
Total loans	551,560	434,623
CRE | Land
Nonaccrual and Past Due Loans
Total loans	123,194	193,637
C&I
Nonaccrual and Past Due Loans
Total loans	9,640,563	8,991,535
C&I | Commercial business
Nonaccrual and Past Due Loans
Total loans	8,959,633	8,201,764
C&I | Trade finance
Nonaccrual and Past Due Loans
Total loans	680,930	789,771
Residential
Nonaccrual and Past Due Loans
Total loans	5,095,718	4,594,336
Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total loans	3,509,779	3,069,969
Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total loans	1,585,939	1,524,367
Consumer
Nonaccrual and Past Due Loans
Total loans	2,075,995	1,957,805
Non-PCI Loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	101,189	53,423
Total Nonaccrual Loans	122,817	121,698
Current Accruing Loans	24,636,688	22,497,873
Total loans	24,860,694	22,672,994
Non-PCI Loans | CRE
Nonaccrual and Past Due Loans
Total loans	8,340,497	7,550,707
Non-PCI Loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	20,313	28,735
Total Nonaccrual Loans	26,907	29,345
Current Accruing Loans	7,620,441	6,872,457
Total loans	7,667,661	6,930,537
Non-PCI Loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	4,994	0
Total Nonaccrual Loans	0	14
Current Accruing Loans	546,566	432,714
Total loans	551,560	432,728
Non-PCI Loans | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	1,124
Total Nonaccrual Loans	5,326	686
Current Accruing Loans	115,950	185,632
Total loans	121,276	187,442
Non-PCI Loans | C&I
Nonaccrual and Past Due Loans
Total loans	9,602,176	8,932,319
Non-PCI Loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	47,331	3,232
Total Nonaccrual Loans	81,248	64,875
Current Accruing Loans	8,792,667	8,075,751
Total loans	8,921,246	8,143,858
Non-PCI Loans | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	8	8
Current Accruing Loans	680,922	788,453
Total loans	680,930	788,461
Non-PCI Loans | Residential
Nonaccrual and Past Due Loans
Total loans	4,860,954	4,256,426
Non-PCI Loans | Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	17,671	10,568
Total Nonaccrual Loans	4,214	8,759
Current Accruing Loans	3,348,784	2,861,009
Total loans	3,370,669	2,880,336
Non-PCI Loans | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	4,325	7,322
Total Nonaccrual Loans	2,984	16,268
Current Accruing Loans	1,482,976	1,352,500
Total loans	1,490,285	1,376,090
Non-PCI Loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6,555	2,442
Total Nonaccrual Loans	2,130	1,743
Current Accruing Loans	2,048,382	1,929,357
Total loans	2,057,067	1,933,542
Non-PCI Loans | Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	73,152	22,796
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6,233	3,481
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	4,994	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	45,052	2,029
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	9,595	7,649
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	3,951	6,339
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,327	2,174
Non-PCI Loans | Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	28,037	30,627
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	14,080	25,254
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	2,279	1,203
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	8,076	2,919
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	374	983
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,228	268
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	78,779	69,251
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	14,872	11,393
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	433	280
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	60,511	50,747
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	8	8
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	0	104
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	2,790	6,473
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	165	232
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	44,038	52,447
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	12,035	17,952
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	4,893	406
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	20,737	14,128
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 | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	4,214	8,655
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	194	9,795
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 1,965	$ 1,511