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Fair Value Measurements and Fair Value of Financial Instruments (Schedule Of Fair Value, Assets And Liabilities Measured On Nonrecurring Basis, Valuation Techniques) (Details) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Impaired Loans [Member] | Residential [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Valuation Techniques | Appraisals of collateral value | Appraisals of collateral value
Impaired Loans [Member] | Residential [Member] | Maximum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range of Unobservable Inputs | 25.00% | 25.00%
Impaired Loans [Member] | Residential [Member] | Minimum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range of Unobservable Inputs | 0.00% | 0.00%
Impaired Loans [Member] | Commercial [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Valuation Techniques | Discounted cash flow model | Discounted cash flow model
Impaired Loans [Member] | Commercial [Member] | Maximum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range of Unobservable Inputs | 6.00% | 6.00%
Impaired Loans [Member] | Commercial [Member] | Minimum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range of Unobservable Inputs | 0.00% | 0.00%
Impaired Loans [Member] | Commercial real estate [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Valuation Techniques | Appraisals of collateral value | Appraisals of collateral value
Impaired Loans [Member] | Commercial real estate [Member] | Maximum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range of Unobservable Inputs | 12.00% | 12.00%
Impaired Loans [Member] | Commercial real estate [Member] | Minimum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range of Unobservable Inputs | 8.00% | 8.00%
Impaired Loans [Member] | Construction [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Valuation Techniques | Appraisals of collateral value | Appraisals of collateral value
Range of Unobservable Inputs | 5.00% | 5.00%
Other Real Estate Owned [Member] | Residential [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Valuation Techniques | Appraisals of collateral value | Appraisals of collateral value
Other Real Estate Owned [Member] | Residential [Member] | Maximum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range of Unobservable Inputs | 25.00% | 25.00%
Estimated Selling Cost Percentage | 8.00% | 8.00%
Other Real Estate Owned [Member] | Residential [Member] | Minimum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Range of Unobservable Inputs | 0.00% | 0.00%
Estimated Selling Cost Percentage | 6.00% | 6.00%
Other Real Estate Owned [Member] | Commercial [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Valuation Techniques | Appraisals of collateral value | Appraisals of collateral value
Range of Unobservable Inputs | 15.00% | 15.00%
Other Real Estate Owned [Member] | Commercial [Member] | Maximum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Selling Cost Percentage | 8.00% | 8.00%
Other Real Estate Owned [Member] | Commercial [Member] | Minimum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Selling Cost Percentage | 6.00% | 6.00%

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- Definition Percentage of the estimated selling cost. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of total financial instruments measured at fair value + References No definition available. + Details
Name: | cnbc_PercentageOfTotalFinancialInstrumentsMeasuredAtFairValue
Namespace Prefix: | cnbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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X
- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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