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Subordinated Debentures (Narrative) (Details) | 6 Months Ended
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Jun. 30, 2013
Debt Instrument [Line Items] |
Subordinated Borrowing, Due Date | Jan. 23, 2034
Rate added to LIBOR | 2.85%
Subordinated Borrowing, Interest Rate | 3.13%

X
- Definition Rate added to LIBOR + References No definition available. + Details
Name: | cnbc_RateAddedToLibor
Namespace Prefix: | cnbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Date the payments are due on subordinated debt, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_SubordinatedBorrowingDueDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stated interest rate of the subordinated debt. + References No definition available. + Details
Name: | us-gaap_SubordinatedBorrowingInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration