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Allowance for Probable Loan Losses (Details 6) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Loan portfolio by credit quality indicator
Portfolio, total	$ 5,122,200	$ 5,410,003
Commercial
Loan portfolio by credit quality indicator
Portfolio, total	770,103	830,524
Commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	658,927	741,006
Commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	5,439	14,015
Commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	6,642	7,187
Commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	75,422	44,890
Commercial | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	23,673	23,426
Commercial real estate: other construction and land development
Loan portfolio by credit quality indicator
Portfolio, total	1,255,368	1,473,471
Commercial real estate: other construction and land development | Pass
Loan portfolio by credit quality indicator
Portfolio, total	1,036,331	1,100,430
Commercial real estate: other construction and land development | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	76,435	117,058
Commercial real estate: other construction and land development | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	5,956	53,770
Commercial real estate: other construction and land development | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	75,360	125,006
Commercial real estate: other construction and land development | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	61,286	77,207
Commercial real estate: farmland and commercial
Loan portfolio by credit quality indicator
Portfolio, total	1,703,367	1,688,563
Commercial real estate: farmland and commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	1,471,031	1,521,243
Commercial real estate: farmland and commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	89,713	42,353
Commercial real estate: farmland and commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	43,223	29,936
Commercial real estate: farmland and commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	52,099	73,187
Commercial real estate: farmland and commercial | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	47,301	21,844
Commercial real estate: multifamily
Loan portfolio by credit quality indicator
Portfolio, total	117,409	96,791
Commercial real estate: multifamily | Pass
Loan portfolio by credit quality indicator
Portfolio, total	116,978	94,973
Commercial real estate: multifamily | Special Review
Loan portfolio by credit quality indicator
Portfolio, total		1,345
Commercial real estate: multifamily | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	431	473
Residential: first lien
Loan portfolio by credit quality indicator
Portfolio, total	522,339	533,455
Residential: first lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	516,375	526,504
Residential: first lien | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	841	2,237
Residential: first lien | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total		1,747
Residential: first lien | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	2,942	952
Residential: first lien | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	2,181	2,015
Residential: junior lien
Loan portfolio by credit quality indicator
Portfolio, total	406,546	415,527
Residential: junior lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	404,225	415,021
Residential: junior lien | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	266
Residential: junior lien | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	323
Residential: junior lien | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	10	307
Residential: junior lien | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	1,722	199
Consumer
Loan portfolio by credit quality indicator
Portfolio, total	101,294	126,047
Consumer | Pass
Loan portfolio by credit quality indicator
Portfolio, total	99,975	125,973
Consumer | Special Review
Loan portfolio by credit quality indicator
Portfolio, total		3
Consumer | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	20	42
Consumer | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	1,299	29
Foreign
Loan portfolio by credit quality indicator
Portfolio, total	245,774	245,625
Foreign | Pass
Loan portfolio by credit quality indicator
Portfolio, total	245,288	234,979
Foreign | Special Review
Loan portfolio by credit quality indicator
Portfolio, total		10,108
Foreign | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	486	531
Foreign | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total		7
Pass
Loan portfolio by credit quality indicator
Portfolio, total	4,549,130	4,760,129
Special Review
Loan portfolio by credit quality indicator
Portfolio, total	172,694	187,119
Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	56,144	92,640
Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	206,339	244,915
Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	$ 137,893	$ 125,200

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- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522



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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-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 AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Chapter 8

-Paragraph 116

-IssueDate 2006-05-01

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph e

-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.

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