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Borrowed Funds (Schedule of Securities Sold Under Agreement for Repurchase) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Borrowed Funds [Abstract]
After 2016	$ 31,000
Total	$ 31,000

X

- Definition

Contractual Obligation Due After Third Year

+ References

No definition available.

+ Details

Name:	cnbc_ContractualObligationDueAfterThirdYear
Namespace Prefix:	cnbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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