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Components of Net Periodic Pension Cost (Narrative) (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 3,500,000 |
Minimum amount to be funded as required by the Pension Relief Act Fifteen Year amortization of the Shortfall Amortization Base | $ 450,000 | $ 300,000
Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Funded Percentage | 85.00% |
Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Funded Percentage | 115.00% |

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- Definition MinimumAmountToBeFundedAsRequiredByPensionReliefActFifteenYearAmortizationOfShortgallAmortizationBase + References No definition available. + Details
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Namespace Prefix: | cnbc_
Data Type: | xbrli:monetaryItemType
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- Details
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- Definition Plan assets of a defined benefit plan, as a percentage of projected benefit obligation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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