NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 4) (Non-covered loans, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014 item		Dec. 31, 2013
Credit Quality Indicators
Number of grades in the risk rating system utilized by the company to rate credit risk of loans receivable	8
Loans receivable, excluding covered loans, gross	$ 18,277,768	[1]	$ 15,678,317	[1]
Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	17,456,101		14,991,479
Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	251,441		197,284
Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	568,794		489,554
Doubtful
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	1,432
Residential
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	4,449,727		4,185,309
Residential | Residential Single-family
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	3,316,581		3,192,875
Residential | Residential Single-family | Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	3,297,111		3,167,337
Residential | Residential Single-family | Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	7,708		8,331
Residential | Residential Single-family | Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	11,762		17,207
Residential | Residential Multifamily
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	1,133,146		992,434
Residential | Residential Multifamily | Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	1,075,296		923,697
Residential | Residential Multifamily | Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross			1,634
Residential | Residential Multifamily | Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	57,850		67,103
Commercial Real Estate ("CRE")
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	5,798,303		4,585,077
Commercial Real Estate ("CRE") | Income producing
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	5,358,710		4,301,030
Commercial Real Estate ("CRE") | Income producing | Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	5,056,988		4,032,269
Commercial Real Estate ("CRE") | Income producing | Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	74,904		56,752
Commercial Real Estate ("CRE") | Income producing | Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	225,774		212,009
Commercial Real Estate ("CRE") | Income producing | Doubtful
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	1,044
Commercial Real Estate ("CRE") | Construction
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	233,105		140,186
Commercial Real Estate ("CRE") | Construction | Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	220,057		127,138
Commercial Real Estate ("CRE") | Construction | Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	6,160		6,160
Commercial Real Estate ("CRE") | Construction | Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	6,888		6,888
Commercial Real Estate ("CRE") | Land
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	206,488		143,861
Commercial Real Estate ("CRE") | Land | Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	178,005		116,000
Commercial Real Estate ("CRE") | Land | Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	6,438		9,304
Commercial Real Estate ("CRE") | Land | Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	22,045		18,557
Commercial and Industrial ("C&I")
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	6,673,303		5,360,193
Commercial and Industrial ("C&I") | Commercial Business
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	5,956,607		4,637,056
Commercial and Industrial ("C&I") | Commercial Business | Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	5,627,827		4,400,847
Commercial and Industrial ("C&I") | Commercial Business | Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	101,399		92,315
Commercial and Industrial ("C&I") | Commercial Business | Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	226,993		143,894
Commercial and Industrial ("C&I") | Commercial Business | Doubtful
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	388
Commercial and Industrial ("C&I") | Trade finance
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	716,696		723,137
Commercial and Industrial ("C&I") | Trade finance | Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	650,525		681,345
Commercial and Industrial ("C&I") | Trade finance | Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	53,821		22,099
Commercial and Industrial ("C&I") | Trade finance | Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	12,350		19,693
Consumer
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	1,356,435		1,547,738
Consumer | Student loans
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	139,736		679,220
Consumer | Student loans | Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	136,553		677,094
Consumer | Student loans | Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	643		445
Consumer | Student loans | Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	2,540		1,681
Consumer | Other Consumer
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	1,216,699		868,518
Consumer | Other Consumer | Pass/Watch
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	1,213,739		865,752
Consumer | Other Consumer | Special Mention
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	368		244
Consumer | Other Consumer | Substandard
Credit Quality Indicators
Loans receivable, excluding covered loans, gross	$ 2,592		$ 2,522

[1] Loans net of ASC 310-30 discount.