The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 9

-Section 03

-Paragraph 7

-Subparagraph d

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

+ Details

Covered Assets and FDIC Loss-sharing Asset (Analysis and Allowance for Losses on Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified									3 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Covered Loans [Member]	Mar. 31, 2012 Covered Loans [Member]	Dec. 31, 2011 Covered Loans [Member]	Jun. 30, 2011 Covered Loans [Member]	Mar. 31, 2011 Covered Loans [Member]	Dec. 31, 2010 Covered Loans [Member]	Jun. 30, 2012 Commercial Portfolio Segment [Member] Covered Loans [Member] risk_rating	Dec. 31, 2011 Commercial Portfolio Segment [Member] Covered Loans [Member] risk_rating	Jun. 30, 2012 Real Estate Portfolio Segment [Member] Covered Loans [Member]	Dec. 31, 2011 Real Estate Portfolio Segment [Member] Covered Loans [Member]	Jun. 30, 2012 Real Estate Portfolio Segment [Member] Covered Loans [Member] One-to-Four Family Residential [Member] risk_rating	Dec. 31, 2011 Real Estate Portfolio Segment [Member] Covered Loans [Member] One-to-Four Family Residential [Member] risk_rating	Jun. 30, 2012 Real Estate Portfolio Segment [Member] Covered Loans [Member] Commercial and Multifamily Residential [Member] risk_rating	Dec. 31, 2011 Real Estate Portfolio Segment [Member] Covered Loans [Member] Commercial and Multifamily Residential [Member] risk_rating	Jun. 30, 2012 Real Estate Construction Portfolio Segment [Member] Covered Loans [Member]	Dec. 31, 2011 Real Estate Construction Portfolio Segment [Member] Covered Loans [Member]	Jun. 30, 2012 Real Estate Construction Portfolio Segment [Member] Covered Loans [Member] One-to-Four Family Residential [Member] risk_rating	Dec. 31, 2011 Real Estate Construction Portfolio Segment [Member] Covered Loans [Member] One-to-Four Family Residential [Member] risk_rating	Jun. 30, 2012 Real Estate Construction Portfolio Segment [Member] Covered Loans [Member] Commercial and Multifamily Residential [Member] risk_rating	Dec. 31, 2011 Real Estate Construction Portfolio Segment [Member] Covered Loans [Member] Commercial and Multifamily Residential [Member] risk_rating	Jun. 30, 2012 Consumer Portfolio Segment [Member] Covered Loans [Member] risk_rating	Dec. 31, 2011 Consumer Portfolio Segment [Member] Covered Loans [Member] risk_rating
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Covered Loans			$ 609,087		$ 721,313				$ 160,250	$ 195,737	$ 345,019	$ 390,636	$ 68,175	$ 79,328	$ 276,844	$ 311,308	$ 54,695	$ 78,063	$ 35,137	$ 54,402	$ 19,558	$ 23,661	$ 49,123	$ 56,877
Weighted Average Risk Rating									5.95	6.05			5.27	5.32	5.46	5.65			6.89	7.32	7.01	7.32	4.73	4.84
Valuation discount resulting from acquisition accounting			114,309		184,440
Allowance for loan losses			31,784	20,504	4,944	7,948	5,633	6,055	9,984	977	14,794	3,361	4,655	678	10,139	2,683	3,542	222	2,202	136	1,340	86	3,464	384
Loans, net	$ 2,847,759	$ 2,827,259	$ 462,994		$ 531,929