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Fair Value Measurements and Fair Value of Financial Instruments (Assets Measured at Fair Value on a Non-Recurring Basis) (Detail) | 3 Months Ended
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Mar. 31, 2014
Impaired Loans [Member] | Residential [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Valuation Techniques | 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%
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%
Impaired Loans [Member] | Commercial [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Valuation Techniques | 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%
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%
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
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%
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%
Impaired Loans [Member] | Construction [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Valuation Techniques | Appraisals of collateral value
Range of Unobservable Inputs | 5.00%
Other Real Estate [Member] | Residential [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Valuation Techniques | Appraisals of collateral value
Other Real Estate [Member] | Residential [Member] | Maximum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Range of Unobservable Inputs | 25.00%
Estimated Selling Cost Percentage | 8.00%
Other Real Estate [Member] | Residential [Member] | Minimum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Range of Unobservable Inputs | 0.00%
Estimated Selling Cost Percentage | 6.00%
Other Real Estate [Member] | Commercial [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Valuation Techniques | Appraisals of collateral value
Range of Unobservable Inputs | 15.00%
Other Real Estate [Member] | Commercial [Member] | Maximum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Estimated Selling Cost Percentage | 8.00%
Other Real Estate [Member] | Commercial [Member] | Minimum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Estimated Selling Cost Percentage | 6.00%

X
- Definition Percentage of the estimated selling cost. + References No definition available. + Details
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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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