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Note 7 - Allowance for Credit Losses: (Detail) (USD $)	Jun. 30, 2012	Jun. 30, 2011
Unfunded Loan Commitments	$ 25,000	$ 20,000

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+ Details

Name:	cfnb_UnfundedLoanCommitments
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant