Fair Value Measurements (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Other Real Estate Valuation Adjustments For Specific Properties	$ 1.1	$ 5.0

Valuation adjustments made to specific other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure.

No definition available.

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Namespace Prefix:	cacb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration