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Loans and the Allowance for Loan Losses (Schedule of Troubled Debt Restructuring) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Troubled debt restructurings: Number of Loans		1
Pre-restructuring Outstanding Recorded Investment		$ 225
Post-restructuring Outstanding Recorded Investment		225
Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Troubled debt restructurings: Number of Loans	1	2
Pre-restructuring Outstanding Recorded Investment	1,354	2,068
Post-restructuring Outstanding Recorded Investment	$ 1,354	$ 2,059

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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X

- Definition

Amount of investment in financing receivables (after modification) modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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Namespace Prefix:	cnbc_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of investment in financing receivables (before modification) modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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Namespace Prefix:	cnbc_
Data Type:	xbrli:monetaryItemType
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X

- Details

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