NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	$ 30,282	$ 34,414
Accruing loans 60 - 89 days past due	9,956	9,183
Total accruing past due loans	40,238	43,597
Nonaccrual loans less than 90 days past due	40,462	27,207
Nonaccrual loans 90 or more days past due	71,189	80,902
Total nonaccrual past due loans	111,651	108,109
Current Accruing loans	15,731,398	11,981,484
Total non-covered loans and loans held for sale, gross	15,883,287	12,133,190
Unearned fees, premiums and discounts, net	(23,672)	(19,301)
Recorded investment in non-covered loans and loans held for sale	15,859,615	12,113,889
Interest Income Foregone on Nonaccrual Loans
Interest income that would have been recognized had nonaccrual loans performed in accordance with their original terms	7,410	7,206	9,384
Less: Interest income recognized on nonaccrual loans on a cash basis	(2,319)	(2,269)	(3,519)
Interest income foregone on nonaccrual loans	5,091	4,937	5,865
Loans Held for Sale
Aging analysis of past Due non-covered loans and loans held for sale
Current Accruing loans	204,970	174,317
Total non-covered loans and loans held for sale, gross	204,970	174,317
Residential | Single-family
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	4,694	4,820
Accruing loans 60 - 89 days past due	922	2,244
Total accruing past due loans	5,616	7,064
Nonaccrual loans less than 90 days past due		1,301
Nonaccrual loans 90 or more days past due	11,218	9,809
Total nonaccrual past due loans	11,218	11,110
Current Accruing loans	3,176,041	2,169,149
Total non-covered loans and loans held for sale, gross	3,192,875	2,187,323
Residential | Multifamily
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	8,580	7,127
Accruing loans 60 - 89 days past due	531	924
Total accruing past due loans	9,111	8,051
Nonaccrual loans less than 90 days past due	19,661	6,788
Nonaccrual loans 90 or more days past due	7,972	11,052
Total nonaccrual past due loans	27,633	17,840
Current Accruing loans	955,690	874,817
Total non-covered loans and loans held for sale, gross	992,434	900,708
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	12,746	18,118
Accruing loans 60 - 89 days past due	1,798	4,731
Total accruing past due loans	14,544	22,849
Nonaccrual loans less than 90 days past due	13,924	9,485
Nonaccrual loans 90 or more days past due	22,549	8,354
Total nonaccrual past due loans	36,473	17,839
Current Accruing loans	4,250,013	3,603,347
Total non-covered loans and loans held for sale, gross	4,301,030	3,644,035
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	27,039
Total nonaccrual past due loans	6,888	27,039
Current Accruing loans	133,298	94,550
Total non-covered loans and loans held for sale, gross	140,186	121,589
Commercial Real Estate ("CRE") | Land
Aging analysis of past Due non-covered loans and loans held for sale
Nonaccrual loans less than 90 days past due	265	637
Nonaccrual loans 90 or more days past due	3,223	3,984
Total nonaccrual past due loans	3,488	4,621
Current Accruing loans	140,373	124,450
Total non-covered loans and loans held for sale, gross	143,861	129,071
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	3,428	3,293
Accruing loans 60 - 89 days past due	6,259	316
Total accruing past due loans	9,687	3,609
Nonaccrual loans less than 90 days past due	6,437	8,068
Nonaccrual loans 90 or more days past due	15,486	14,740
Total nonaccrual past due loans	21,923	22,808
Current Accruing loans	4,605,446	3,542,971
Total non-covered loans and loans held for sale, gross	4,637,056	3,569,388
Commercial and Industrial ("C&I") | Trade finance
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due		500
Total accruing past due loans		500
Nonaccrual loans less than 90 days past due		429
Nonaccrual loans 90 or more days past due	909	2,003
Total nonaccrual past due loans	909	2,432
Current Accruing loans	722,228	658,945
Total non-covered loans and loans held for sale, gross	723,137	661,877
Consumer | Student loans
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	541	71
Accruing loans 60 - 89 days past due	445
Total accruing past due loans	986	71
Nonaccrual loans 90 or more days past due	1,681
Total nonaccrual past due loans	1,681
Current Accruing loans	676,553	475,728
Total non-covered loans and loans held for sale, gross	679,220	475,799
Consumer | Other Consumer
Aging analysis of past Due non-covered loans and loans held for sale
Accruing loans 30 - 59 days past due	293	485
Accruing loans 60 - 89 days past due	1	968
Total accruing past due loans	294	1,453
Nonaccrual loans less than 90 days past due	175	499
Nonaccrual loans 90 or more days past due	1,263	3,921
Total nonaccrual past due loans	1,438	4,420
Current Accruing loans	866,786	263,210
Total non-covered loans and loans held for sale, gross	$ 868,518	$ 269,083