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Borrowed Funds (Schedule of Securities Sold Under Agreement for Repurchase) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2012
Borrowed Funds [Abstract] |
2015 | $ 10
Thereafter | 31
Total | $ 41

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- Definition SecuritesContractedForRepaymentDueAfterFiveYears + References No definition available. + Details
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Namespace Prefix: | cnbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Securities contracted for repayment in two years + References No definition available. + Details
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Namespace Prefix: | cnbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total securites contracted for repayment + References No definition available. + Details
Name: | cnbc_TotalSecuritesContractedForRepayment
Namespace Prefix: | cnbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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