Commitments and Contingencies (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Contract Amount [Abstract]
Commitments to Extend Credit	$ 68,742,000cban_LoanCommitmentContractAmount	$ 65,688,000cban_LoanCommitmentContractAmount
Standby Letters of Credit	$ 1,762,000	$ 1,411,000
Expiration period of letter of credit issued	1 year

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

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