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Subordinated Debentures (Narrative) (Details)	3 Months Ended
	Mar. 31, 2014
Debt Instrument [Line Items]
Subordinated Borrowing, Due Date	Jan. 23, 2034
Rate added to LIBOR	2.85%
Subordinated Borrowing, Interest Rate	3.09%

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