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Loans, Allowance For Loan Losses And OREO (Schedule Of Defaults During Stated Period Of Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 contract | Mar. 31, 2012 contract
Financing Receivable, Modifications [Line Items] |  |
Number of loans classified as TDRs | 0 | 0
Number of Contracts (That Subsequently Defaulted) | 0 |
Commercial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts (That Subsequently Defaulted) |  | 2
Recorded Investment |  | 590

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- Definition Financing receivables, defaults, number of defaults + References No definition available. + Details
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Namespace Prefix: | cik0001275101_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing receivables defaults, recorded investment at default date + References No definition available. + Details
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Namespace Prefix: | cik0001275101_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Troubled Debt Restructuring Modifications Number Of Contracts + References No definition available. + Details
Name: | cik0001275101_TroubledDebtRestructuringModificationsNumberOfContracts
Namespace Prefix: | cik0001275101_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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