LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Loans Modified as TDRs) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($) consecutive_payment loans	Dec. 31, 2015 USD ($)
Loans and Leases Receivable Disclosure [Abstract]
Number of consecutive payments required \| consecutive_payment	6
Financing Receivable, Modifications [Line Items]
Accrual	$ 523	$ 2,313
Nonaccrual	955	1,131
Total TDRs	1,478	3,444
Allowance for Loan Losses Allocated	$ 0	467
Number of TDR loans made to borrowers \| loans	0
Number of TDR loans modified \| loans	0
Commercial construction and land development
Financing Receivable, Modifications [Line Items]
Accrual	$ 0	1,059
Nonaccrual	404	557
Total TDRs	404	1,616
Allowance for Loan Losses Allocated	0	447
Commercial real estate
Financing Receivable, Modifications [Line Items]
Accrual	300	1,028
Nonaccrual	551	574
Total TDRs	851	1,602
Allowance for Loan Losses Allocated	0	20
Residential mortgage
Financing Receivable, Modifications [Line Items]
Accrual	223	226
Nonaccrual	0	0
Total TDRs	223	226
Allowance for Loan Losses Allocated	$ 0	$ 0

Financing Receivable, Modifications, Post-Modification Recorded Investment, Accrual of Interest

No definition available.

Name:	fofn_FinancingReceivableModificationsPostModificationRecordedInvestmentAccrualofInterest
Namespace Prefix:	fofn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Modifications, Post-Modification Recorded Investment, Nonaccrual of Interest

+ References

No definition available.

+ Details

Name:	fofn_FinancingReceivableModificationsPostModificationRecordedInvestmentNonaccrualofInterest
Namespace Prefix:	fofn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Number of Payments Required for Change in Loan Status

+ References

No definition available.

+ Details

Name:	fofn_FinancingReceivableNumberofPaymentsRequiredforChangeinLoanStatus
Namespace Prefix:	fofn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings.

+ References

No definition available.

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

+ Details

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

- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=fofn_CommercialConstructionAndLandDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: