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LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | $ (255,812) |  | $ (264,959) |  |  |
Loans, net | 24,476,150 |  | 23,378,789 |  |  |
CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (71,977) |  | (81,538) |  |  |
C&I |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (143,447) |  | (134,606) |  |  |
Residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (32,500) |  | (39,295) |  |  |
Consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (7,888) |  | (9,520) |  |  |
Loans Receivable |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 24,724,591 |  | 23,659,761 |  |  |
Unearned fees, premiums, and discounts, net | 7,371 |  | (16,013) |  |  |
Allowance for loan losses | (255,812) | $ (266,768) | (264,959) | $ (264,430) | $ (261,229) | $ (261,679)
Loans, net | 24,476,150 |  | 23,378,789 |  |  |
Loans Receivable | CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 8,515,079 |  | 8,110,749 |  |  |
Loans Receivable | CRE | Income producing |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 7,780,775 |  | 7,478,474 |  |  |
Loans Receivable | CRE | Construction |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 600,803 |  | 438,671 |  |  |
Loans Receivable | CRE | Land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 133,501 |  | 193,604 |  |  |
Loans Receivable | C&I |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 9,358,045 |  | 9,003,007 |  |  |
Loans Receivable | C&I | Commercial business |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 8,683,442 |  | 8,213,897 |  |  |
Loans Receivable | C&I | Trade finance |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 674,603 |  | 789,110 |  |  |
Loans Receivable | Residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 4,771,993 |  | 4,589,914 |  |  |
Loans Receivable | Residential | Real estate loan | Single-family |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 3,351,867 |  | 3,066,919 |  |  |
Loans Receivable | Residential | Real estate loan | Multifamily |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 1,420,126 |  | 1,522,995 |  |  |
Loans Receivable | Consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 2,079,474 |  | 1,956,091 |  |  |
Loans Receivable | Non-PCI Loans |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 24,007,010 |  | 22,689,007 |  |  |
Unearned fees, premiums, and discounts, net | 7,371 |  | (16,013) |  |  |
Allowance for loan losses | (255,656) | (266,511) | (264,600) | (263,889) | (260,617) | (260,965)
Loans, net | 23,758,725 |  | 22,408,394 |  |  |
Loans Receivable | Non-PCI Loans | CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 8,119,569 |  | 7,561,384 |  |  |
Allowance for loan losses | (71,829) | (78,102) | (81,191) | (77,777) | (75,496) | (72,263)
Loans Receivable | Non-PCI Loans | CRE | Income producing |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 7,387,777 |  | 6,937,199 |  |  |
Loans Receivable | Non-PCI Loans | CRE | Construction |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 600,803 |  | 436,776 |  |  |
Loans Receivable | Non-PCI Loans | CRE | Land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 130,989 |  | 187,409 |  |  |
Loans Receivable | Non-PCI Loans | C&I |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 9,315,160 |  | 8,943,791 |  |  |
Allowance for loan losses | (143,444) | (148,427) | (134,597) | (138,929) | (133,962) | (134,598)
Loans Receivable | Non-PCI Loans | C&I | Commercial business |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 8,640,569 |  | 8,155,991 |  |  |
Loans Receivable | Non-PCI Loans | C&I | Trade finance |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 674,591 |  | 787,800 |  |  |
Loans Receivable | Non-PCI Loans | Residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 4,513,103 |  | 4,252,004 |  |  |
Allowance for loan losses | (32,495) | (31,561) | (39,292) | (36,812) | (40,668) | (43,856)
Loans Receivable | Non-PCI Loans | Residential | Real estate loan | Single-family |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 3,201,245 |  | 2,877,286 |  |  |
Loans Receivable | Non-PCI Loans | Residential | Real estate loan | Multifamily |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 1,311,858 |  | 1,374,718 |  |  |
Loans Receivable | Non-PCI Loans | Consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 2,059,178 |  | 1,931,828 |  |  |
Allowance for loan losses | (7,888) | $ (8,421) | (9,520) | $ (10,371) | $ (10,491) | $ (10,248)
Loans Receivable | PCI Loans |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 717,581 |  | 970,754 |  |  |
Allowance for loan losses | (156) |  | (359) |  |  |
Loans, net | 717,425 |  | 970,395 |  |  |
Loans Receivable | PCI Loans | CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 395,510 |  | 549,365 |  |  |
Loans Receivable | PCI Loans | CRE | Income producing |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 392,998 |  | 541,275 |  |  |
Loans Receivable | PCI Loans | CRE | Construction |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 0 |  | 1,895 |  |  |
Loans Receivable | PCI Loans | CRE | Land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 2,512 |  | 6,195 |  |  |
Loans Receivable | PCI Loans | C&I |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 42,885 |  | 59,216 |  |  |
Loans Receivable | PCI Loans | C&I | Commercial business |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 42,873 |  | 57,906 |  |  |
Loans Receivable | PCI Loans | C&I | Trade finance |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 12 |  | 1,310 |  |  |
Loans Receivable | PCI Loans | Residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 258,890 |  | 337,910 |  |  |
Loans Receivable | PCI Loans | Residential | Real estate loan | Single-family |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 150,622 |  | 189,633 |  |  |
Loans Receivable | PCI Loans | Residential | Real estate loan | Multifamily |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 108,268 |  | 148,277 |  |  |
Loans Receivable | PCI Loans | Consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | $ 20,296 |  | $ 24,263 |  |  |

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