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LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | $ (266,768) |  | $ (264,959) |  |  |
Loans, net | 23,969,599 |  | 23,378,789 |  |  |
CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (78,345) |  | (81,538) |  |  |
C&I |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (148,435) |  | (134,606) |  |  |
Residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (31,567) |  | (39,295) |  |  |
Consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Allowance for loan losses | (8,421) |  | (9,520) |  |  |
Loans Receivable |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 24,236,216 |  | 23,659,761 |  |  |
Unearned fees, premiums, and discounts, net | 151 |  | (16,013) |  |  |
Allowance for loan losses | (266,768) | $ (260,238) | (264,959) | $ (261,229) | $ (257,738) | $ (261,679)
Loans, net | 23,969,599 |  | 23,378,789 |  |  |
Loans Receivable | CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 8,476,682 |  | 8,110,749 |  |  |
Loans Receivable | CRE | Income producing |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 7,812,733 |  | 7,478,474 |  |  |
Loans Receivable | CRE | Construction |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 522,967 |  | 438,671 |  |  |
Loans Receivable | CRE | Land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 140,982 |  | 193,604 |  |  |
Loans Receivable | C&I |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 9,163,804 |  | 9,003,007 |  |  |
Loans Receivable | C&I | Commercial business |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 8,449,136 |  | 8,213,897 |  |  |
Loans Receivable | C&I | Trade finance |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 714,668 |  | 789,110 |  |  |
Loans Receivable | Residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 4,532,300 |  | 4,589,914 |  |  |
Loans Receivable | Residential | Single-family |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 3,186,031 |  | 3,066,919 |  |  |
Loans Receivable | Residential | Multifamily |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 1,346,269 |  | 1,522,995 |  |  |
Loans Receivable | Consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 2,063,430 |  | 1,956,091 |  |  |
Loans Receivable | Non-PCI Loans |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 23,442,173 |  | 22,689,007 |  |  |
Unearned fees, premiums, and discounts, net | 151 |  | (16,013) |  |  |
Allowance for loan losses | (266,511) | (259,910) | (264,600) | (260,617) | (257,095) | (260,965)
Loans, net | 23,175,813 |  | 22,408,394 |  |  |
Loans Receivable | Non-PCI Loans | CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 8,025,630 |  | 7,561,384 |  |  |
Allowance for loan losses | (78,102) | (82,538) | (81,191) | (75,496) | (69,740) | (72,263)
Loans Receivable | Non-PCI Loans | CRE | Income producing |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 7,364,321 |  | 6,937,199 |  |  |
Loans Receivable | Non-PCI Loans | CRE | Construction |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 522,967 |  | 436,776 |  |  |
Loans Receivable | Non-PCI Loans | CRE | Land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 138,342 |  | 187,409 |  |  |
Loans Receivable | Non-PCI Loans | C&I |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 9,117,182 |  | 8,943,791 |  |  |
Allowance for loan losses | (148,427) | (134,077) | (134,597) | (133,962) | (133,914) | (134,598)
Loans Receivable | Non-PCI Loans | C&I | Commercial business |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 8,402,526 |  | 8,155,991 |  |  |
Loans Receivable | Non-PCI Loans | C&I | Trade finance |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 714,656 |  | 787,800 |  |  |
Loans Receivable | Non-PCI Loans | Residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 4,257,575 |  | 4,252,004 |  |  |
Allowance for loan losses | (31,561) | (33,935) | (39,292) | (40,668) | (42,990) | (43,856)
Loans Receivable | Non-PCI Loans | Residential | Single-family |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 3,027,217 |  | 2,877,286 |  |  |
Loans Receivable | Non-PCI Loans | Residential | Multifamily |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 1,230,358 |  | 1,374,718 |  |  |
Loans Receivable | Non-PCI Loans | Consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 2,041,786 |  | 1,931,828 |  |  |
Allowance for loan losses | (8,421) | $ (9,360) | (9,520) | $ (10,491) | $ (10,451) | $ (10,248)
Loans Receivable | PCI Loans |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 794,043 |  | 970,754 |  |  |
Allowance for loan losses | (257) |  | (359) |  |  |
Loans, net | 793,786 |  | 970,395 |  |  |
Loans Receivable | PCI Loans | CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 451,052 |  | 549,365 |  |  |
Loans Receivable | PCI Loans | CRE | Income producing |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 448,412 |  | 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 | 2,640 |  | 6,195 |  |  |
Loans Receivable | PCI Loans | C&I |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 46,622 |  | 59,216 |  |  |
Loans Receivable | PCI Loans | C&I | Commercial business |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 46,610 |  | 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 | 274,725 |  | 337,910 |  |  |
Loans Receivable | PCI Loans | Residential | Single-family |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 158,814 |  | 189,633 |  |  |
Loans Receivable | PCI Loans | Residential | Multifamily |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | 115,911 |  | 148,277 |  |  |
Loans Receivable | PCI Loans | Consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Total loans | $ 21,644 |  | $ 24,263 |  |  |

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