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Allowance for Probable Loan Losses (Details 3) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 106,618	$ 108,030
Commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	22,880	22,614
Commercial real estate: other construction and land development
Loan loss allowances, financing receivable past due
Non-accrual loans, total	55,194	77,207
Commercial real estate: farmland and commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	26,129	5,486
Commercial real estate: multifamily
Loan loss allowances, financing receivable past due
Non-accrual loans, total	431	473
Residential: first lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	1,856	2,015
Residential: junior lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	76	199
Consumer
Loan loss allowances, financing receivable past due
Non-accrual loans, total	52	29
Foreign
Loan loss allowances, financing receivable past due
Non-accrual loans, total		$ 7

X

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5111-111524

-Subparagraph (d)

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration