LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 3) - Loans Receivable - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Nonaccrual and Past Due Loans
Total loans	$ 23,659,761	$ 21,727,145
Number of days a loan is past due and is placed on nonaccrual status	90 days
CRE
Nonaccrual and Past Due Loans
Total loans	$ 8,110,749	6,819,513
CRE | Income producing
Nonaccrual and Past Due Loans
Total loans	7,478,474	6,256,059
CRE | Construction
Nonaccrual and Past Due Loans
Total loans	438,671	332,287
CRE | Land
Nonaccrual and Past Due Loans
Total loans	193,604	231,167
C&I
Nonaccrual and Past Due Loans
Total loans	9,003,007	8,077,201
C&I | Commercial business
Nonaccrual and Past Due Loans
Total loans	8,213,897	7,181,189
C&I | Trade finance
Nonaccrual and Past Due Loans
Total loans	789,110	896,012
Residential
Nonaccrual and Past Due Loans
Total loans	4,589,914	5,316,689
Residential | Single-family
Nonaccrual and Past Due Loans
Total loans	3,066,919	3,866,781
Residential | Multifamily
Nonaccrual and Past Due Loans
Total loans	1,522,995	1,449,908
Consumer
Nonaccrual and Past Due Loans
Total loans	1,956,091	1,513,742
Non-PCI loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	53,194	40,235
Total Nonaccrual Loans	121,369	100,262
Current Accruing Loans	22,514,444	20,264,535
Total loans	22,689,007	20,405,032
Non-PCI loans | CRE
Nonaccrual and Past Due Loans
Total loans	7,561,384	6,102,216
Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	28,721	17,764
Total Nonaccrual Loans	29,229	28,513
Current Accruing Loans	6,879,249	5,521,769
Total loans	6,937,199	5,568,046
Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	14	6,913
Current Accruing Loans	436,762	312,930
Total loans	436,776	319,843
Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,124	0
Total Nonaccrual Loans	683	2,723
Current Accruing Loans	185,602	211,604
Total loans	187,409	214,327
Non-PCI loans | C&I
Nonaccrual and Past Due Loans
Total loans	8,943,791	7,987,581
Non-PCI loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,177	7,548
Total Nonaccrual Loans	64,735	28,436
Current Accruing Loans	8,088,079	7,061,869
Total loans	8,155,991	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	787,800	889,363
Total loans	787,800	889,728
Non-PCI loans | Residential
Nonaccrual and Past Due Loans
Total loans	4,252,004	4,831,279
Non-PCI loans | Residential | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	10,584	7,675
Total Nonaccrual Loans	8,726	8,625
Current Accruing Loans	2,857,976	3,630,962
Total loans	2,877,286	3,647,262
Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,301	4,932
Total Nonaccrual Loans	16,244	20,819
Current Accruing Loans	1,351,173	1,158,266
Total loans	1,374,718	1,184,017
Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,287	2,316
Total Nonaccrual Loans	1,738	3,868
Current Accruing Loans	1,927,803	1,477,772
Total loans	1,931,828	1,483,956
Accruing Loans 30-59 Days Past Due | Non-PCI loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	22,636	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	3,465	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	1,124	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	1,992	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	7,657	6,381
Accruing Loans 30-59 Days Past Due | Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6,320	4,425
Accruing Loans 30-59 Days Past Due | Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,078	2,154
Accruing Loans 60-89 Days Past Due | Non-PCI loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	30,558	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	25,256	3,593
Accruing Loans 60-89 Days Past Due | Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Accruing Loans 60-89 Days Past Due | Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	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	1,185	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	2,927	1,294
Accruing Loans 60-89 Days Past Due | Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	981	507
Accruing Loans 60-89 Days Past Due | Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	209	162
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	69,187	41,770
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	11,359	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	277	221
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	50,726	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	92	2,861
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	6,486	12,460
Nonaccrual Loans Less Than 90 Days Past Due | Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	233	169
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	52,182	58,492
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	17,870	9,165
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	6,898
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | CRE | Land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	406	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	14,009	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	8,634	5,764
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | Residential | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	9,758	8,359
Nonaccrual Loans 90 or More Days Past Due | Non-PCI loans | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 1,505	$ 3,699