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Allowance for Probable Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 75,467	$ 118,505
Commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	22,662	26,819
Commercial real estate: other construction and land development
Loan loss allowances, financing receivable past due
Non-accrual loans, total	31,698	54,336
Commercial real estate: farmland and commercial
Loan loss allowances, financing receivable past due
Non-accrual loans, total	18,619	34,910
Commercial real estate: multifamily
Loan loss allowances, financing receivable past due
Non-accrual loans, total	368	411
Residential: first lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	1,796	1,848
Residential: junior lien
Loan loss allowances, financing receivable past due
Non-accrual loans, total	235	135
Consumer
Loan loss allowances, financing receivable past due
Non-accrual loans, total	42	46
Foreign
Loan loss allowances, financing receivable past due
Non-accrual loans, total	$ 47

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

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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