Covered Assets and FDIC Loss-sharing Asset Coverd Assets Credit Quality Indicators (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Reported Amount	$ 2,864,803	$ 2,827,259
Covered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	500,794	721,313
Valuation discount resulting from acquisition accounting	79,401	184,440
Loans and Leases Receivable, Allowance	30,056	4,944	6,055
Loans and Leases Receivable, Net Reported Amount	391,337	531,929
Covered Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	356,520	454,104
Covered Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	11,003	23,029
Covered Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	133,271	241,261
Covered Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	2,870
Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	49
Real Estate Portfolio Segment [Member] | Covered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	290,256	390,636
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	57,150	79,328
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	26,628	44,187
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	105,384	148,919
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	101,094	118,202
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	44,782	56,948
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	16,336	21,947
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	81,205	109,339
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	82,222	89,555
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,344	2,210
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	1,213
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	864	4,013
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,318	3,673
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	11,024	20,170
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	10,292	21,027
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	23,315	35,567
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	15,554	24,974
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	40,649	78,063
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	25,398	54,402
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	12,320	19,364
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,931	4,297
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	13,833	25,304
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	11,565	29,098
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,419	2,928
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,107	1,142
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,817	4,834
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	6,050	8,264
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	2,779
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,273	1,535
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	371
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	7,901	13,657
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,824	3,155
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	5,743	17,646
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	5,515	20,463
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	1,289
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Real Estate Construction Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	0
Consumer Portfolio Segment [Member] | Covered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	44,516	56,877
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	38,973	48,067
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	381	255
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	5,162	8,150
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	357
Consumer Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	48
Commercial Portfolio Segment [Member] | Covered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	125,373	195,737
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	118,594	184,714
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	6,779	11,023
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	71,621	103,472
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Pass [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,988	7,608
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,823	6,239
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Special Mention [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	741
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	45,150	73,793
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Substandard [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,791	2,659
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	1,209
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Doubtful [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	15
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0	1
Commercial Portfolio Segment [Member] | Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	$ 0	$ 0