COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Carrying Amounts And Composition Of Covered Loans
Total principal balance	$ 2,259,959	$ 2,461,560
Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,867,677	2,003,632
Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	45,092	43,604
Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	339,798	406,855
Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	7,392	7,469
Real Estate Loans
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,791,873	1,960,966
Real Estate Loans | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,447,748	1,553,493
Real Estate Loans | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	38,028	38,841
Real Estate Loans | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	298,734	361,266
Real Estate Loans | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	7,363	7,366
Real Estate Loans | Residential Single-family
Carrying Amounts And Composition Of Covered Loans
Total principal balance	276,330	290,095
Real Estate Loans | Residential Single-family | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	268,006	281,246
Real Estate Loans | Residential Single-family | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	380	733
Real Estate Loans | Residential Single-family | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	7,944	8,116
Real Estate Loans | Residential Multifamily
Carrying Amounts And Composition Of Covered Loans
Total principal balance	374,252	403,508
Real Estate Loans | Residential Multifamily | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	349,242	373,024
Real Estate Loans | Residential Multifamily | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	785	785
Real Estate Loans | Residential Multifamily | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	24,225	29,699
Real Estate Loans | Commercial and Industrial Real Estate
Carrying Amounts And Composition Of Covered Loans
Total principal balance	1,031,161	1,103,530
Real Estate Loans | Commercial and Industrial Real Estate | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	807,815	857,376
Real Estate Loans | Commercial and Industrial Real Estate | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	27,432	27,851
Real Estate Loans | Commercial and Industrial Real Estate | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	189,446	211,835
Real Estate Loans | Commercial and Industrial Real Estate | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	6,468	6,468
Real Estate Loans | Construction and Land
Carrying Amounts And Composition Of Covered Loans
Total principal balance	110,130	163,833
Real Estate Loans | Construction and Land | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	22,685	41,847
Real Estate Loans | Construction and Land | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	9,431	9,472
Real Estate Loans | Construction and Land | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	77,119	111,616
Real Estate Loans | Construction and Land | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	895	898
Other Loans
Carrying Amounts And Composition Of Covered Loans
Total principal balance	468,086	500,594
Other Loans | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	419,929	450,139
Other Loans | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	7,064	4,763
Other Loans | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	41,064	45,589
Other Loans | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	29	103
Other Loans | Commercial Business
Carrying Amounts And Composition Of Covered Loans
Total principal balance	395,718	426,621
Other Loans | Commercial Business | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	349,330	378,086
Other Loans | Commercial Business | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	6,914	4,635
Other Loans | Commercial Business | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	39,445	43,797
Other Loans | Commercial Business | Doubtful
Carrying Amounts And Composition Of Covered Loans
Total principal balance	29	103
Other Loans | Other Consumer
Carrying Amounts And Composition Of Covered Loans
Total principal balance	72,368	73,973
Other Loans | Other Consumer | Pass/Watch
Carrying Amounts And Composition Of Covered Loans
Total principal balance	70,599	72,053
Other Loans | Other Consumer | Special Mention
Carrying Amounts And Composition Of Covered Loans
Total principal balance	150	128
Other Loans | Other Consumer | Substandard
Carrying Amounts And Composition Of Covered Loans
Total principal balance	$ 1,619	$ 1,792