COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Carrying Amounts And Composition Of Covered Loans
Total principal balance	$ 2,908,773	$ 3,450,956
Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	2,269,715	2,569,918
Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	33,714	58,016
Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	597,609	814,814
Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	7,735	8,208
Real Estate Loans
Carrying Amounts And Composition Of Covered Loans
Total principal balance	2,347,985	2,775,972
Real Estate Loans | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,792,433	2,050,246
Real Estate Loans | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	21,706	34,968
Real Estate Loans | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	526,306	682,745
Real Estate Loans | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	7,540	8,013
Real Estate Loans | Residential Single-family
Carrying Amounts And Composition Of Covered Loans
Total principal balance	314,483	362,345
Real Estate Loans | Residential Single-family | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	300,876	345,568
Real Estate Loans | Residential Single-family | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,253	982
Real Estate Loans | Residential Single-family | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	12,354	15,795
Real Estate Loans | Residential Multifamily
Carrying Amounts And Composition Of Covered Loans
Total principal balance	513,141	647,440
Real Estate Loans | Residential Multifamily | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	466,014	571,061
Real Estate Loans | Residential Multifamily | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	2,868	8,074
Real Estate Loans | Residential Multifamily | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	44,259	68,305
Real Estate Loans | Commercial and Industrial Real Estate
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,190,964	1,348,556
Real Estate Loans | Commercial and Industrial Real Estate | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	884,924	963,069
Real Estate Loans | Commercial and Industrial Real Estate | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	8,031	10,777
Real Estate Loans | Commercial and Industrial Real Estate | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	291,368	367,869
Real Estate Loans | Commercial and Industrial Real Estate | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	6,641	6,841
Real Estate Loans | Construction and Land
Carrying Amounts And Composition Of Covered Loans
Total principal balance	329,397	417,631
Real Estate Loans | Construction and Land | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	140,619	170,548
Real Estate Loans | Construction and Land | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	9,554	15,135
Real Estate Loans | Construction and Land | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	178,325	230,776
Real Estate Loans | Construction and Land | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	899	1,172
Other Loans
Carrying Amounts And Composition Of Covered Loans
Total principal balance	560,788	674,984
Other Loans | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	477,282	519,672
Other Loans | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	12,008	23,048
Other Loans | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	71,303	132,069
Other Loans | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	195	195
Other Loans | Commercial Business
Carrying Amounts And Composition Of Covered Loans
Total principal balance	481,255	587,333
Other Loans | Commercial Business | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	399,075	434,138
Other Loans | Commercial Business | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	11,880	22,533
Other Loans | Commercial Business | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	70,105	130,467
Other Loans | Commercial Business | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	195	195
Other Loans | Other Consumer
Carrying Amounts And Composition Of Covered Loans
Total principal balance	79,533	87,651
Other Loans | Other Consumer | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	78,207	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	$ 1,198	$ 1,602