COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Carrying Amounts And Composition Of Covered Loans
Total principal balance	$ 2,691,069	$ 3,450,956
Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	2,106,594	2,569,918
Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	39,546	58,016
Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	537,315	814,814
Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	7,614	8,208
Real Estate Loans
Carrying Amounts And Composition Of Covered Loans
Total principal balance	2,160,072	2,775,972
Real Estate Loans | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,651,196	2,050,246
Real Estate Loans | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	26,136	34,968
Real Estate Loans | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	475,289	682,745
Real Estate Loans | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	7,451	8,013
Real Estate Loans | Residential Single-family
Carrying Amounts And Composition Of Covered Loans
Total principal balance	305,357	362,345
Real Estate Loans | Residential Single-family | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	293,549	345,568
Real Estate Loans | Residential Single-family | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	701	982
Real Estate Loans | Residential Single-family | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	11,107	15,795
Real Estate Loans | Residential Multifamily
Carrying Amounts And Composition Of Covered Loans
Total principal balance	456,185	647,440
Real Estate Loans | Residential Multifamily | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	414,872	571,061
Real Estate Loans | Residential Multifamily | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	785	8,074
Real Estate Loans | Residential Multifamily | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	40,528	68,305
Real Estate Loans | Commercial and Industrial Real Estate
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,110,227	1,348,556
Real Estate Loans | Commercial and Industrial Real Estate | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	814,378	963,069
Real Estate Loans | Commercial and Industrial Real Estate | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	13,155	10,777
Real Estate Loans | Commercial and Industrial Real Estate | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	276,140	367,869
Real Estate Loans | Commercial and Industrial Real Estate | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	6,554	6,841
Real Estate Loans | Construction and Land
Carrying Amounts And Composition Of Covered Loans
Total principal balance	288,303	417,631
Real Estate Loans | Construction and Land | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	128,397	170,548
Real Estate Loans | Construction and Land | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	11,495	15,135
Real Estate Loans | Construction and Land | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	147,514	230,776
Real Estate Loans | Construction and Land | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	897	1,172
Other Loans
Carrying Amounts And Composition Of Covered Loans
Total principal balance	530,997	674,984
Other Loans | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	455,398	519,672
Other Loans | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	13,410	23,048
Other Loans | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	62,026	132,069
Other Loans | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	163	195
Other Loans | Commercial Business
Carrying Amounts And Composition Of Covered Loans
Total principal balance	454,973	587,333
Other Loans | Commercial Business | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	381,222	434,138
Other Loans | Commercial Business | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	13,282	22,533
Other Loans | Commercial Business | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	60,306	130,467
Other Loans | Commercial Business | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	163	195
Other Loans | Other Consumer
Carrying Amounts And Composition Of Covered Loans
Total principal balance	76,024	87,651
Other Loans | Other Consumer | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	74,176	85,534
Other Loans | Other Consumer | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	128	515
Other Loans | Other Consumer | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	$ 1,720	$ 1,602