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Business Combinations (Schedule of Changes In Accretable Discount Related To Purchased-Credit-Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |
Accretable discount balance, beginning of period | $ 130 | $ 0
Additions resulting from acquisition | 0 | 161
Accretion to interest income | (130) | (31)
Accretable discount, end of period | $ 0 | $ 130

X
- Definition Amount of accretable discount as of the reporting date. + References No definition available. + Details
Name: | cnbc_AccretableDiscount
Namespace Prefix: | cnbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of Accretion to interest income during the period. + References No definition available. + Details
Name: | cnbc_AccretionToInterestIncome
Namespace Prefix: | cnbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of additions resulting from acquisition during the period. + References No definition available. + Details
Name: | cnbc_AdditionsResultingFromAcquisition
Namespace Prefix: | cnbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration