LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Allowance for loan losses	$ (264,959)	$ (261,679)
Loans, net	23,378,789	21,468,270
CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Allowance for loan losses	(81,538)	(72,977)
C&I
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Allowance for loan losses	(134,606)	(134,598)
Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Allowance for loan losses	(39,295)	(43,856)
Consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Allowance for loan losses	(9,520)	(10,248)
Loans Receivable
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	23,659,761	21,727,145
Unearned fees, premiums, and discounts, net	(16,013)	2,804
Allowance for loan losses	(264,959)	(261,679)	$ (249,675)	$ (234,535)
Loans, net	23,378,789	21,468,270
Loans Receivable | CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	8,110,749	6,819,513
Loans Receivable | CRE | Income producing
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	7,478,474	6,256,059
Loans Receivable | CRE | Construction
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	438,671	332,287
Loans Receivable | CRE | Land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	193,604	231,167
Loans Receivable | C&I
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	9,003,007	8,077,201
Loans Receivable | C&I | Commercial business
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	8,213,897	7,181,189
Loans Receivable | C&I | Trade finance
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	789,110	896,012
Loans Receivable | Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	4,589,914	5,316,689
Loans Receivable | Residential | Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	3,066,919	3,866,781
Loans Receivable | Residential | Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,522,995	1,449,908
Loans Receivable | Consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,956,091	1,513,742
Loans Receivable | Non-PCI loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	22,689,007	20,405,032
Unearned fees, premiums, and discounts, net	(16,013)	2,804
Allowance for loan losses	(264,600)	(260,965)	(247,406)	(234,535)
Loans, net	22,408,394	20,146,871
Loans Receivable | Non-PCI loans | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	21,910,821	19,625,603
Loans Receivable | Non-PCI loans | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	287,530	213,007
Loans Receivable | Non-PCI loans | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	466,129	565,834
Loans Receivable | Non-PCI loans | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	24,527	533
Loans Receivable | Non-PCI loans | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	55
Loans Receivable | Non-PCI loans | CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	7,561,384	6,102,216
Allowance for loan losses	(81,191)	(72,263)	(70,154)	(72,385)
Loans Receivable | Non-PCI loans | CRE | Income producing
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	6,937,199	5,568,046
Loans Receivable | Non-PCI loans | CRE | Income producing | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	6,672,951	5,243,640
Loans Receivable | Non-PCI loans | CRE | Income producing | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	59,309	54,673
Loans Receivable | Non-PCI loans | CRE | Income producing | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	204,939	269,733
Loans Receivable | Non-PCI loans | CRE | Income producing | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | CRE | Income producing | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | CRE | Construction
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	436,776	319,843
Loans Receivable | Non-PCI loans | CRE | Construction | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	435,112	310,259
Loans Receivable | Non-PCI loans | CRE | Construction | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,194	11
Loans Receivable | Non-PCI loans | CRE | Construction | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	470	9,573
Loans Receivable | Non-PCI loans | CRE | Construction | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | CRE | Construction | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | CRE | Land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	187,409	214,327
Loans Receivable | Non-PCI loans | CRE | Land | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	172,189	185,220
Loans Receivable | Non-PCI loans | CRE | Land | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	5,701
Loans Receivable | Non-PCI loans | CRE | Land | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	15,220	23,406
Loans Receivable | Non-PCI loans | CRE | Land | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | CRE | Land | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | C&I
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	8,943,791	7,987,581
Allowance for loan losses	(134,597)	(134,598)	(115,184)	(107,719)
Loans Receivable | Non-PCI loans | C&I | Commercial business
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	8,155,991	7,097,853
Loans Receivable | Non-PCI loans | C&I | Commercial business | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	7,794,735	6,836,914
Loans Receivable | Non-PCI loans | C&I | Commercial business | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	201,280	130,319
Loans Receivable | Non-PCI loans | C&I | Commercial business | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	135,449	130,032
Loans Receivable | Non-PCI loans | C&I | Commercial business | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	24,527	533
Loans Receivable | Non-PCI loans | C&I | Commercial business | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	55
Loans Receivable | Non-PCI loans | C&I | Trade finance
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	787,800	889,728
Loans Receivable | Non-PCI loans | C&I | Trade finance | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	750,144	845,889
Loans Receivable | Non-PCI loans | C&I | Trade finance | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	13,812	13,031
Loans Receivable | Non-PCI loans | C&I | Trade finance | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	23,844	30,808
Loans Receivable | Non-PCI loans | C&I | Trade finance | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | C&I | Trade finance | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	4,252,004	4,831,279
Allowance for loan losses	(39,292)	(43,856)	(50,716)	(49,436)
Loans Receivable | Non-PCI loans | Residential | Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	2,877,286	3,647,262
Loans Receivable | Non-PCI loans | Residential | Single-family | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	2,841,722	3,627,491
Loans Receivable | Non-PCI loans | Residential | Single-family | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	8,134	3,143
Loans Receivable | Non-PCI loans | Residential | Single-family | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	27,430	16,628
Loans Receivable | Non-PCI loans | Residential | Single-family | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | Residential | Single-family | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | Residential | Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,374,718	1,184,017
Loans Receivable | Non-PCI loans | Residential | Multifamily | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,317,550	1,095,982
Loans Receivable | Non-PCI loans | Residential | Multifamily | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	2,918	5,124
Loans Receivable | Non-PCI loans | Residential | Multifamily | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	54,250	82,911
Loans Receivable | Non-PCI loans | Residential | Multifamily | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | Residential | Multifamily | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | Consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,931,828	1,483,956
Allowance for loan losses	(9,520)	(10,248)	$ (11,352)	$ (4,995)
Loans Receivable | Non-PCI loans | Consumer | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,926,418	1,480,208
Loans Receivable | Non-PCI loans | Consumer | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	883	1,005
Loans Receivable | Non-PCI loans | Consumer | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	4,527	2,743
Loans Receivable | Non-PCI loans | Consumer | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | Non-PCI loans | Consumer | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	970,754	1,322,113
Allowance for loan losses	(359)	(714)
Loans, net	970,395	1,321,399
Loans Receivable | PCI Loans | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	835,890	1,089,726
Loans Receivable | PCI Loans | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	7,551	18,688
Loans Receivable | PCI Loans | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	127,313	213,699
Loans Receivable | PCI Loans | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	549,365	717,297
Loans Receivable | PCI Loans | CRE | Income producing
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	541,275	688,013
Loans Receivable | PCI Loans | CRE | Income producing | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	440,100	534,015
Loans Receivable | PCI Loans | CRE | Income producing | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	4,987	9,960
Loans Receivable | PCI Loans | CRE | Income producing | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	96,188	144,038
Loans Receivable | PCI Loans | CRE | Income producing | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | CRE | Income producing | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | CRE | Construction
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,895	12,444
Loans Receivable | PCI Loans | CRE | Construction | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	589
Loans Receivable | PCI Loans | CRE | Construction | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	1,744
Loans Receivable | PCI Loans | CRE | Construction | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,895	10,111
Loans Receivable | PCI Loans | CRE | Construction | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | CRE | Construction | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | CRE | Land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	6,195	16,840
Loans Receivable | PCI Loans | CRE | Land | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	4,285	7,012
Loans Receivable | PCI Loans | CRE | Land | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	5,391
Loans Receivable | PCI Loans | CRE | Land | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,910	4,437
Loans Receivable | PCI Loans | CRE | Land | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | CRE | Land | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | C&I
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	59,216	89,620
Loans Receivable | PCI Loans | C&I | Commercial business
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	57,906	83,336
Loans Receivable | PCI Loans | C&I | Commercial business | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	52,212	70,586
Loans Receivable | PCI Loans | C&I | Commercial business | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	819	1,103
Loans Receivable | PCI Loans | C&I | Commercial business | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	4,875	11,647
Loans Receivable | PCI Loans | C&I | Commercial business | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | C&I | Commercial business | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | C&I | Trade finance
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,310	6,284
Loans Receivable | PCI Loans | C&I | Trade finance | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,310	4,620
Loans Receivable | PCI Loans | C&I | Trade finance | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | C&I | Trade finance | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	1,664
Loans Receivable | PCI Loans | C&I | Trade finance | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | C&I | Trade finance | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	337,910	485,410
Loans Receivable | PCI Loans | Residential | Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	189,633	219,519
Loans Receivable | PCI Loans | Residential | Single-family | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	184,092	213,829
Loans Receivable | PCI Loans | Residential | Single-family | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	1,293	374
Loans Receivable | PCI Loans | Residential | Single-family | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	4,248	5,316
Loans Receivable | PCI Loans | Residential | Single-family | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | Residential | Single-family | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | Residential | Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	148,277	265,891
Loans Receivable | PCI Loans | Residential | Multifamily | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	130,770	230,049
Loans Receivable | PCI Loans | Residential | Multifamily | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | Residential | Multifamily | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	17,507	35,842
Loans Receivable | PCI Loans | Residential | Multifamily | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | Residential | Multifamily | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | Consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	24,263	29,786
Loans Receivable | PCI Loans | Consumer | Pass/Watch
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	23,121	29,026
Loans Receivable | PCI Loans | Consumer | Special Mention
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	452	116
Loans Receivable | PCI Loans | Consumer | Substandard
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	690	644
Loans Receivable | PCI Loans | Consumer | Doubtful
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	0	0
Loans Receivable | PCI Loans | Consumer | Loss
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans	$ 0	$ 0