NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 4) (Non-covered loans, USD $) In Thousands, unless otherwise specified	Sep. 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
Non-Covered Loans	$ 19,351,556	[1]	$ 15,678,317	[1]
Pass/Watch
Credit Quality Indicators
Non-Covered Loans	18,633,206		14,991,479
Special Mention
Credit Quality Indicators
Non-Covered Loans	275,309		197,284
Substandard
Credit Quality Indicators
Non-Covered Loans	441,735		489,554
Doubtful
Credit Quality Indicators
Non-Covered Loans	1,306
Residential
Credit Quality Indicators
Non-Covered Loans	4,649,295		4,185,309
Residential | Residential Single-family
Credit Quality Indicators
Non-Covered Loans	3,472,725		3,192,875
Residential | Residential Single-family | Pass/Watch
Credit Quality Indicators
Non-Covered Loans	3,449,646		3,167,337
Residential | Residential Single-family | Special Mention
Credit Quality Indicators
Non-Covered Loans	5,169		8,331
Residential | Residential Single-family | Substandard
Credit Quality Indicators
Non-Covered Loans	17,910		17,207
Residential | Residential Multifamily
Credit Quality Indicators
Non-Covered Loans	1,176,570		992,434
Residential | Residential Multifamily | Pass/Watch
Credit Quality Indicators
Non-Covered Loans	1,114,395		923,697
Residential | Residential Multifamily | Special Mention
Credit Quality Indicators
Non-Covered Loans	5,149		1,634
Residential | Residential Multifamily | Substandard
Credit Quality Indicators
Non-Covered Loans	57,026		67,103
Commercial Real Estate ("CRE")
Credit Quality Indicators
Non-Covered Loans	5,949,350		4,585,077
Commercial Real Estate ("CRE") | Income producing
Credit Quality Indicators
Non-Covered Loans	5,463,209		4,301,030
Commercial Real Estate ("CRE") | Income producing | Pass/Watch
Credit Quality Indicators
Non-Covered Loans	5,186,262		4,032,269
Commercial Real Estate ("CRE") | Income producing | Special Mention
Credit Quality Indicators
Non-Covered Loans	72,725		56,752
Commercial Real Estate ("CRE") | Income producing | Substandard
Credit Quality Indicators
Non-Covered Loans	203,445		212,009
Commercial Real Estate ("CRE") | Income producing | Doubtful
Credit Quality Indicators
Non-Covered Loans	777
Commercial Real Estate ("CRE") | Construction
Credit Quality Indicators
Non-Covered Loans	287,341		140,186
Commercial Real Estate ("CRE") | Construction | Pass/Watch
Credit Quality Indicators
Non-Covered Loans	274,293		127,138
Commercial Real Estate ("CRE") | Construction | Special Mention
Credit Quality Indicators
Non-Covered Loans	6,160		6,160
Commercial Real Estate ("CRE") | Construction | Substandard
Credit Quality Indicators
Non-Covered Loans	6,888		6,888
Commercial Real Estate ("CRE") | Land
Credit Quality Indicators
Non-Covered Loans	198,800		143,861
Commercial Real Estate ("CRE") | Land | Pass/Watch
Credit Quality Indicators
Non-Covered Loans	175,033		116,000
Commercial Real Estate ("CRE") | Land | Special Mention
Credit Quality Indicators
Non-Covered Loans	6,378		9,304
Commercial Real Estate ("CRE") | Land | Substandard
Credit Quality Indicators
Non-Covered Loans	17,389		18,557
Commercial and Industrial ("C&I")
Credit Quality Indicators
Non-Covered Loans	7,283,658		5,360,193
Commercial and Industrial ("C&I") | Commercial Business
Credit Quality Indicators
Non-Covered Loans	6,539,640		4,637,056
Commercial and Industrial ("C&I") | Commercial Business | Pass/Watch
Credit Quality Indicators
Non-Covered Loans	6,264,128		4,400,847
Commercial and Industrial ("C&I") | Commercial Business | Special Mention
Credit Quality Indicators
Non-Covered Loans	157,768		92,315
Commercial and Industrial ("C&I") | Commercial Business | Substandard
Credit Quality Indicators
Non-Covered Loans	117,215		143,894
Commercial and Industrial ("C&I") | Commercial Business | Doubtful
Credit Quality Indicators
Non-Covered Loans	529
Commercial and Industrial ("C&I") | Trade finance
Credit Quality Indicators
Non-Covered Loans	744,018		723,137
Commercial and Industrial ("C&I") | Trade finance | Pass/Watch
Credit Quality Indicators
Non-Covered Loans	707,963		681,345
Commercial and Industrial ("C&I") | Trade finance | Special Mention
Credit Quality Indicators
Non-Covered Loans	19,999		22,099
Commercial and Industrial ("C&I") | Trade finance | Substandard
Credit Quality Indicators
Non-Covered Loans	16,056		19,693
Consumer
Credit Quality Indicators
Non-Covered Loans	1,469,253		1,547,738
Consumer | Student loans
Credit Quality Indicators
Non-Covered Loans	93,179		679,220
Consumer | Student loans | Pass/Watch
Credit Quality Indicators
Non-Covered Loans	88,786		677,094
Consumer | Student loans | Special Mention
Credit Quality Indicators
Non-Covered Loans	1,048		445
Consumer | Student loans | Substandard
Credit Quality Indicators
Non-Covered Loans	3,345		1,681
Consumer | Other Consumer
Credit Quality Indicators
Non-Covered Loans	1,376,074		868,518
Consumer | Other Consumer | Pass/Watch
Credit Quality Indicators
Non-Covered Loans	1,372,700		865,752
Consumer | Other Consumer | Special Mention
Credit Quality Indicators
Non-Covered Loans	913		244
Consumer | Other Consumer | Substandard
Credit Quality Indicators
Non-Covered Loans	$ 2,461		$ 2,522

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