Business Combinations (Schedule of Changes In Accretable Discount Related To Purchased-Credit-Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Accretable discount balance, beginning of period	$ 130	$ 0
Additions resulting from acquisition	0	161
Accretion to interest income	(130)	(31)
Accretable discount, end of period	$ 0	$ 130

Amount of additions resulting from acquisition during the period.

No definition available.

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