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Other Borrowings (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012
Reverse repurchase agreements | $ 3,000
Credit through FHLBA | 86,280
Community Bankers Bank [Member] |
Unsecured federal fund lines | 11,000
Zions Bank [Member] |
Unsecured federal fund lines | 4,000
Suntrust Bank [Member] |
Unsecured federal fund lines | $ 3,000
Maximum [Member] |
Period allowed to exchange securities pledged as collateral for funds | 90 days
Minimum [Member] |
Period allowed to exchange securities pledged as collateral for funds | 30 days

X
- Definition Duration Securities Pledged As Collateral In Exchange For Funds + References No definition available. + Details
Name: | cik0001275101_DurationSecuritiesPledgedAsCollateralInExchangeForFunds
Namespace Prefix: | cik0001275101_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line Of Credit Unsecured Federal Funds + References No definition available. + Details
Name: | cik0001275101_LineOfCreditUnsecuredFederalFunds
Namespace Prefix: | cik0001275101_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Unsecured Debt Reverse Repurchase Agreements + References No definition available. + Details
Name: | cik0001275101_UnsecuredDebtReverseRepurchaseAgreements
Namespace Prefix: | cik0001275101_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Carrying amount of Federal Home Loan Bank (FHLB) loans (advances) to member financial institutions. + References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankAdvances
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant