Other Real Estate Owned ("OREO"), net (Schedule of Other Real Estate Owned Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Real Estate [Abstract]
Operating costs	$ 10	$ 45
Additions to the valuation allowance	0	167
Total	$ 10	$ 212

Real Estate Owned, Valuation Allowance, Provision and Other

No definition available.

Name:	cacb_RealEstateOwnedValuationAllowanceProvisionandOther
Namespace Prefix:	cacb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration