No authoritative reference available.

No definition available.

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

Total estimated residual value of leased assets under a lease agreement.

No definition available.

Name:	cfnb_EstimatedResidualValueLeasedAssets
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Estimated residual value of leased assets under a lease agreement which matures within one year of the balance sheet date.

No definition available.

Name:	cfnb_EstimatedResidualValueLeasedAssetsCurrent
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Estimated residual value of leased assets under a lease agreement which matures within the fifth year from the balance sheet date.

No definition available.

Name:	cfnb_EstimatedResidualValueLeasedAssetsMaturingInFiveYears
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Estimated residual value of leased assets under a lease agreement which matures within the fourth year from the balance sheet date.

No definition available.

Name:	cfnb_EstimatedResidualValueLeasedAssetsMaturingInFourYears
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Estimated residual value of leased assets under a lease agreement which matures within the third year after the balance sheet date.

No definition available.

Name:	cfnb_EstimatedResidualValueLeasedAssetsMaturinginThreeYears
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Estimated residual value of leased assets under a lease agreement which matures within the second year from the balance sheet date.

No definition available.

Name:	cfnb_EstimatedResidualValueLeasedAssetsMaturingInTwoYears
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Net of the estimated residual value of leased assets less the unearned income and allowances associated.

No definition available.

Name:	cfnb_NetEstimatedResidualValueofLeasedAssets
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Net investment in leases, excluding the net estimated residual values.

No definition available.

Name:	cfnb_NetLeaseReceivable
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No authoritative reference available.

No definition available.

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

Total lease receivable plus the estimated residual value of leased assets.

No definition available.

Name:	cfnb_TotalLeaseReceivablePlusEstimatedResidualValue
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Total lease receivable plus the estimated residual value of leased assets maturing after five years.

No definition available.

Name:	cfnb_TotalLeaseReceivablePlusEstimatedResidualValueMaturingAfterFiveYears.
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Total lease receivable plus the estimated residual value of leased assets maturing in five years.

No definition available.

Name:	cfnb_TotalLeaseReceivablePlusEstimatedResidualValueMaturingInFiveYears
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Total lease receivable plus the estimated residual value of leased assets maturing in four years.

No definition available.

Name:	cfnb_TotalLeaseReceivablePlusEstimatedResidualValueMaturingInFourYears
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Total lease receivable plus the estimated residual value of leased assets maturing in three years.

No definition available.

Name:	cfnb_TotalLeaseReceivablePlusEstimatedResidualValueMaturingInThreeYears
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Total lease receivable plus the estimated residual value of leased assets maturing in two years.

No definition available.

Name:	cfnb_TotalLeaseReceivablePlusEstimatedResidualValueMaturingInTwoYears
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Total lease receivable plus the estimated residual value of leased assets maturing within one year.

No definition available.

Name:	cfnb_TotalLeaseReceivablePlusEstimatedResidualValueMaturingWithinOneYear
Namespace Prefix:	cfnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Unearned income associated with the estimated residual value of leased assets.

No definition available.

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

Unearned income relating to lease receivables.

No definition available.

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

No authoritative reference available.

No definition available.

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

This element represents revenue received, but not recognized for financial reporting purposes. Such deferred revenue may consist of and include amounts paid in advance by lessees and is net of the accumulated amortization of such amounts that to date have been recognized in revenue.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

The net amount due as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing and sales-type leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs on direct financing leases; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6952072&loc=d3e45377-112738

Name:	us-gaap_NetInvestmentInDirectFinancingAndSalesTypeLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph b(ii)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Future rental payments receivable within one year of the balance sheet date under an operating lease.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Future rental payments receivable within the third year from the balance sheet date under an operating lease.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Future rental payments receivable within the second year from the balance sheet date under an operating lease.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.