Commitments (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Commitments to extend credit:
Fixed rate	$ 31,217	$ 14,439
Variable rate	49,052	53,275
Standby letters of credit	$ 550	$ 670

Commitments to extend credit standby letters of credit.

No definition available.

Name:	cldb_CommitmentsToExtendCreditStandbyLettersOfCredit
Namespace Prefix:	cldb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant