NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Aging analysis of past Due non-covered loans and loans held for sale
Number of days a loan is past due and is placed on nonaccrual status	90 days
Accruing loans 30 - 59 days past due	$ 42,111		$ 30,282
Accruing loans 60 - 89 days past due	20,872		9,956
Total accruing past due loans	62,983		40,238
Nonaccrual loans less than 90 days past due	45,396		40,462
Nonaccrual loans 90 or more days past due	87,130		71,189
Total nonaccrual past due loans	132,526		111,651
Current Accruing loans	17,690,255		15,731,398
Total non-covered loans and loans held for sale, gross	17,885,764		15,883,287
Unearned fees, premiums and discounts, net	(9,349)		(23,672)
Recorded investment in non-covered loans and loans held for sale	17,876,415		15,859,615
Interest Income Foregone on Nonaccrual Loans
Interest income that would have been recognized had nonaccrual loans performed in accordance with their original terms	2,026	1,656
Less: Interest income recognized on nonaccrual loans on a cash basis	(769)	(606)
Interest income foregone on nonaccrual loans	1,257	1,050
Loans Held for Sale
Aging analysis of past Due non-covered loans and loans held for sale
Current Accruing loans	577,353		204,970
Total non-covered loans and loans held for sale, gross	577,353		204,970
Residential | Single-family
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	7,530		4,694
Accruing loans 60 - 89 days past due	3,373		922
Total accruing past due loans	10,903		5,616
Nonaccrual loans less than 90 days past due	3,999
Nonaccrual loans 90 or more days past due	10,069		11,218
Total nonaccrual past due loans	14,068		11,218
Current Accruing loans	3,213,327		3,176,041
Total non-covered loans and loans held for sale, gross	3,238,298		3,192,875
Residential | Multifamily
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	3,519		8,580
Accruing loans 60 - 89 days past due	2,947		531
Total accruing past due loans	6,466		9,111
Nonaccrual loans less than 90 days past due	11,105		19,661
Nonaccrual loans 90 or more days past due	11,585		7,972
Total nonaccrual past due loans	22,690		27,633
Current Accruing loans	1,082,032		955,690
Total non-covered loans and loans held for sale, gross	1,111,188		992,434
Commercial Real Estate ("CRE") | Income producing
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	25,702		12,746
Accruing loans 60 - 89 days past due	8,280		1,798
Total accruing past due loans	33,982		14,544
Nonaccrual loans less than 90 days past due	23,402		13,924
Nonaccrual loans 90 or more days past due	24,354		22,549
Total nonaccrual past due loans	47,756		36,473
Current Accruing loans	5,036,639		4,250,013
Total non-covered loans and loans held for sale, gross	5,118,377		4,301,030
Commercial Real Estate ("CRE") | Construction
Aging analysis of past Due non-covered loans and loans held for sale
Nonaccrual loans 90 or more days past due	6,888		6,888
Total nonaccrual past due loans	6,888		6,888
Current Accruing loans	190,740		133,298
Total non-covered loans and loans held for sale, gross	197,628		140,186
Commercial Real Estate ("CRE") | Land
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 60 - 89 days past due	2,871
Total accruing past due loans	2,871
Nonaccrual loans less than 90 days past due	1,708		265
Nonaccrual loans 90 or more days past due	9,330		3,223
Total nonaccrual past due loans	11,038		3,488
Current Accruing loans	190,006		140,373
Total non-covered loans and loans held for sale, gross	203,915		143,861
Commercial and Industrial ("C&I") | Commercial Business
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	3,654		3,428
Accruing loans 60 - 89 days past due	2,906		6,259
Total accruing past due loans	6,560		9,687
Nonaccrual loans less than 90 days past due	4,682		6,437
Nonaccrual loans 90 or more days past due	21,777		15,486
Total nonaccrual past due loans	26,459		21,923
Current Accruing loans	5,500,360		4,605,446
Total non-covered loans and loans held for sale, gross	5,533,379		4,637,056
Commercial and Industrial ("C&I") | Trade finance
Aging analysis of past Due non-covered loans and loans held for sale
Nonaccrual loans less than 90 days past due	500
Nonaccrual loans 90 or more days past due	116		909
Total nonaccrual past due loans	616		909
Current Accruing loans	667,088		722,228
Total non-covered loans and loans held for sale, gross	667,704		723,137
Consumer | Student loans
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	1,215		541
Accruing loans 60 - 89 days past due	148		445
Total accruing past due loans	1,363		986
Nonaccrual loans 90 or more days past due	1,690		1,681
Total nonaccrual past due loans	1,690		1,681
Current Accruing loans	181,847		676,553
Total non-covered loans and loans held for sale, gross	184,900		679,220
Consumer | Other Consumer
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	491		293
Accruing loans 60 - 89 days past due	347		1
Total accruing past due loans	838		294
Nonaccrual loans less than 90 days past due			175
Nonaccrual loans 90 or more days past due	1,321		1,263
Total nonaccrual past due loans	1,321		1,438
Current Accruing loans	1,050,863		866,786
Total non-covered loans and loans held for sale, gross	$ 1,053,022		$ 868,518