NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	$ 15,678,317	$ 11,958,873
Unearned fees, premiums and discounts, net	(23,672)	(19,301)
Allowance for non-covered loans receivable	(241,930)	(229,382)
Non-covered loans receivable, excluding covered loans, net	15,412,715	11,710,190
Residential
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	4,185,309	3,088,031
Residential | Single-family
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	3,192,875	2,187,323
Residential | Multifamily
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	992,434	900,708
Commercial Real Estate ("CRE")
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	4,585,077	3,894,695
Commercial Real Estate ("CRE") | Income producing
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	4,301,030	3,644,035
Commercial Real Estate ("CRE") | Construction
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	140,186	121,589
Commercial Real Estate ("CRE") | Land
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	143,861	129,071
Commercial and Industrial ("C&I")
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	5,360,193	4,231,265
Commercial and Industrial ("C&I") | Commercial Business
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	4,637,056	3,569,388
Commercial and Industrial ("C&I") | Trade finance
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	723,137	661,877
Consumer
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	1,547,738	744,882
Consumer | Student loans
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	679,220	475,799
Consumer | Other Consumer
Non-Covered loans receivable disclosures
Loans receivable, excluding covered loans, gross	$ 868,518	$ 269,083