COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Carrying Amounts And Composition Of Covered Loans
Total principal balance	$ 3,450,956	$ 4,718,084
Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	2,569,918	3,439,848
Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	58,016	146,585
Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	814,814	1,112,568
Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	8,208	19,083
Real Estate Loans
Carrying Amounts And Composition Of Covered Loans
Total principal balance	2,775,972	3,788,478
Real Estate Loans | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	2,050,246	2,700,389
Real Estate Loans | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	34,968	111,878
Real Estate Loans | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	682,745	961,813
Real Estate Loans | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	8,013	14,398
Real Estate Loans | Residential Single-family
Carrying Amounts And Composition Of Covered Loans
Total principal balance	362,345	442,732
Real Estate Loans | Residential Single-family | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	345,568	427,918
Real Estate Loans | Residential Single-family | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	982	1,085
Real Estate Loans | Residential Single-family | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	15,795	13,729
Real Estate Loans | Residential Multifamily
Carrying Amounts And Composition Of Covered Loans
Total principal balance	647,440	918,941
Real Estate Loans | Residential Multifamily | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	571,061	779,694
Real Estate Loans | Residential Multifamily | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	8,074	26,124
Real Estate Loans | Residential Multifamily | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	68,305	113,123
Real Estate Loans | Commercial and Industrial Real Estate
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,348,556	1,773,760
Real Estate Loans | Commercial and Industrial Real Estate | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	963,069	1,249,781
Real Estate Loans | Commercial and Industrial Real Estate | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	10,777	43,810
Real Estate Loans | Commercial and Industrial Real Estate | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	367,869	472,003
Real Estate Loans | Commercial and Industrial Real Estate | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	6,841	8,166
Real Estate Loans | Construction and Land
Carrying Amounts And Composition Of Covered Loans
Total principal balance	417,631	653,045
Real Estate Loans | Construction and Land | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	170,548	242,996
Real Estate Loans | Construction and Land | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	15,135	40,859
Real Estate Loans | Construction and Land | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	230,776	362,958
Real Estate Loans | Construction and Land | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,172	6,232
Other Loans
Carrying Amounts And Composition Of Covered Loans
Total principal balance	674,984	929,606
Other Loans | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	519,672	739,459
Other Loans | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	23,048	34,707
Other Loans | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	132,069	150,755
Other Loans | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	195	4,685
Other Loans | Commercial Business
Carrying Amounts And Composition Of Covered Loans
Total principal balance	587,333	831,762
Other Loans | Commercial Business | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	434,138	643,117
Other Loans | Commercial Business | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	22,533	34,707
Other Loans | Commercial Business | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	130,467	149,253
Other Loans | Commercial Business | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	195	4,685
Other Loans | Other Consumer
Carrying Amounts And Composition Of Covered Loans
Total principal balance	87,651	97,844
Other Loans | Other Consumer | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	85,534	96,342
Other Loans | Other Consumer | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	515
Other Loans | Other Consumer | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	$ 1,602	$ 1,502