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Allowance for Probable Loan Losses (Details 6) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Loan portfolio by credit quality indicator
Portfolio, total	$ 5,256,183	$ 5,410,003
Commercial
Loan portfolio by credit quality indicator
Portfolio, total	822,922	830,524
Commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	733,204	741,006
Commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	5,807	14,015
Commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	6,839	7,187
Commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	53,707	44,890
Commercial | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	23,365	23,426
Commercial real estate: other construction and land development
Loan portfolio by credit quality indicator
Portfolio, total	2,658,034	2,615,878
Commercial real estate: other construction and land development | Pass
Loan portfolio by credit quality indicator
Portfolio, total	999,131	1,100,430
Commercial real estate: other construction and land development | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	79,988	117,058
Commercial real estate: other construction and land development | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	42,215	53,770
Commercial real estate: other construction and land development | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	143,639	125,006
Commercial real estate: other construction and land development | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	32,674	77,207
Commercial real estate: farmland and commercial
Loan portfolio by credit quality indicator
Portfolio, total	1,722,383	1,688,563
Commercial real estate: farmland and commercial | Pass
Loan portfolio by credit quality indicator
Portfolio, total	1,492,529	1,521,243
Commercial real estate: farmland and commercial | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	98,524	42,353
Commercial real estate: farmland and commercial | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	36,639	29,936
Commercial real estate: farmland and commercial | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	63,351	73,187
Commercial real estate: farmland and commercial | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	31,340	21,844
Commercial real estate: multifamily
Loan portfolio by credit quality indicator
Portfolio, total	112,729	96,791
Commercial real estate: multifamily | Pass
Loan portfolio by credit quality indicator
Portfolio, total	88,792	94,973
Commercial real estate: multifamily | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	23,497	1,345
Commercial real estate: multifamily | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	440	473
Residential: first lien
Loan portfolio by credit quality indicator
Portfolio, total	536,477	533,455
Residential: first lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	530,461	526,504
Residential: first lien | Special Review
Loan portfolio by credit quality indicator
Portfolio, total	636	2,237
Residential: first lien | Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	61	1,747
Residential: first lien | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	3,520	952
Residential: first lien | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	1,799	2,015
Residential: junior lien
Loan portfolio by credit quality indicator
Portfolio, total	407,501	415,527
Residential: junior lien | Pass
Loan portfolio by credit quality indicator
Portfolio, total	405,942	415,021
Residential: junior lien | Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	40	307
Residential: junior lien | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	1,519	199
Consumer
Loan portfolio by credit quality indicator
Portfolio, total	108,113	126,047
Consumer | Pass
Loan portfolio by credit quality indicator
Portfolio, total	106,969	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	44	42
Consumer | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	1,100	29
Foreign
Loan portfolio by credit quality indicator
Portfolio, total	248,411	245,625
Foreign | Pass
Loan portfolio by credit quality indicator
Portfolio, total	247,913	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	497	531
Foreign | Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	1	7
Pass
Loan portfolio by credit quality indicator
Portfolio, total	4,604,941	4,760,129
Special Review
Loan portfolio by credit quality indicator
Portfolio, total	208,452	187,119
Watch List - Pass
Loan portfolio by credit quality indicator
Portfolio, total	85,754	92,640
Watch List - Substandard
Loan portfolio by credit quality indicator
Portfolio, total	264,798	244,915
Watch List - Impaired
Loan portfolio by credit quality indicator
Portfolio, total	$ 92,238	$ 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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