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Allowance for Probable Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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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 |

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

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