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Borrowed Funds (Schedule of Securities Sold Under Agreement for Repurchase) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Borrowed Funds [Abstract]
2015	$ 10
Thereafter	31
Total	$ 41

X

- Definition

SecuritesContractedForRepaymentDueAfterFiveYears

+ References

No definition available.

+ Details

Name:	cnbc_SecuritesContractedForRepaymentDueAfterFiveYears
Namespace Prefix:	cnbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Securities contracted for repayment in two years

+ References

No definition available.

+ Details

Name:	cnbc_SecuritiesContractedForRepaymentInTwoYears
Namespace Prefix:	cnbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Total securites contracted for repayment

+ References

No definition available.

+ Details

Name:	cnbc_TotalSecuritesContractedForRepayment
Namespace Prefix:	cnbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration