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Allowance for Probable Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Loan portfolio by credit quality indicator
Portfolio, total	$ 5,053,475	$ 5,410,003
Pass
Loan portfolio by credit quality indicator
Portfolio, total	4,496,404	4,760,129
Special Review
Loan portfolio by credit quality indicator
Portfolio, total	165,714	187,119
Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	59,349	92,640
Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	195,703	244,915
Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	136,305	125,200
Commercial
Loan portfolio by credit quality indicator
Portfolio, total	773,816	830,524
Commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	655,154	741,006
Commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	5,279	14,015
Commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	6,361	7,187
Commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	79,419	44,890
Commercial | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	27,603	23,426
Commercial real estate: other construction and land development
Loan portfolio by credit quality indicator
Portfolio, total	1,273,389	1,473,471
Commercial real estate: other construction and land development | Pass
Loan portfolio by credit quality indicator
Portfolio, total	1,058,843	1,100,430
Commercial real estate: other construction and land development | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	76,722	117,058
Commercial real estate: other construction and land development | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	11,083	53,770
Commercial real estate: other construction and land development | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	66,313	125,006
Commercial real estate: other construction and land development | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	60,428	77,207
Commercial real estate: farmland and commercial
Loan portfolio by credit quality indicator
Portfolio, total	1,664,687	1,688,563
Commercial real estate: farmland and commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	1,449,822	1,521,243
Commercial real estate: farmland and commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	83,581	42,353
Commercial real estate: farmland and commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	40,510	29,936
Commercial real estate: farmland and commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	48,543	73,187
Commercial real estate: farmland and commercial | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	42,231	21,844
Commercial real estate: multifamily
Loan portfolio by credit quality indicator
Portfolio, total	121,599	96,791
Commercial real estate: multifamily | Pass
Loan portfolio by credit quality indicator
Portfolio, total	121,188	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	411	473
Residential: first lien
Loan portfolio by credit quality indicator
Portfolio, total	495,722	533,455
Residential: first lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	490,924	526,504
Residential: first lien | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	132	2,237
Residential: first lien | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	974	1,747
Residential: first lien | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	1,402	952
Residential: first lien | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	2,290	2,015
Residential: junior lien
Loan portfolio by credit quality indicator
Portfolio, total	400,148	415,527
Residential: junior lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	397,861	415,021
Residential: junior lien | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	319
Residential: junior lien | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	6	307
Residential: junior lien | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	1,962	199
Consumer
Loan portfolio by credit quality indicator
Portfolio, total	94,109	126,047
Consumer | Pass
Loan portfolio by credit quality indicator
Portfolio, total	92,714	125,973
Consumer | Special Review
Loan portfolio by credit quality indicator
Portfolio, total		3
Consumer | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	41
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	1,334	29
Foreign
Loan portfolio by credit quality indicator
Portfolio, total	230,005	245,625
Foreign | Pass
Loan portfolio by credit quality indicator
Portfolio, total	229,898	234,979
Foreign | Special Review
Loan portfolio by credit quality indicator
Portfolio, total		10,108
Foreign | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	61
Foreign | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total		531
Foreign | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	$ 46	$ 7

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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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