2.4.0.80606 - Disclosure - Partnership Capital Subject to Mandatory Redemption (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$Jan_01_2013_Jun_28_2013http://www.sec.gov/CIK0000815917duration2013-01-01T00:00:002013-06-28T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$TwelveMonthsEnded_31Dec2012http://www.sec.gov/CIK0000815917duration2012-01-01T00:00:002012-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$BalanceAsOf_29Jun2012http://www.sec.gov/CIK0000815917instant2012-06-29T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDfalsefalse$BalanceAsOf_31Dec2011http://www.sec.gov/CIK0000815917instant2011-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3jnfc_PartnershipsCapitalSubjectToMandatoryRedemptionAbstractjnfc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Partner capital outstanding:2false 4us-gaap_LimitedPartnersCapitalAccountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse645464000645464USD$falsetruefalse2truefalsefalse650735000650735USD$falsetruefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of the limited partners' ownership interests.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F false2Limited partnership capital3false 4jnfc_SubordinatedLimitedPartnershipCapitaljnfc_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse305215000305215falsefalsefalse2truefalsefalse283709000283709falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetarySubordinated limited partnership capital.No definition available.false2Subordinated limited partnership capital4false 4us-gaap_GeneralPartnersCapitalAccountus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse10911270001091127falsefalsefalse2truefalsefalse10480670001048067falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of the general partner's ownership interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F false2General partnership capital5false 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4jnfc_PartnershipLoanOutstandingAtBeginningOfPeriodjnfc_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-170264000-170264falsefalsefalse2truefalsefalse-86853000-86853falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryPartnership loan outstanding at beginning of period.No definition available.false2Partnership loans outstanding at beginning of period8false 4jnfc_PartnershipLoansIssuedjnfc_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-105228000-105228falsefalsefalse2truefalsefalse-94170000-94170falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryPartnership loans issued.No definition available.false2Partnership loans issued during the period9false 4jnfc_RepaymentOfPartnershipLoansjnfc_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse4434000044340falsefalsefalse2truefalsefalse1075900010759falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepayment of partnership loans.No definition available.false2Repayment of partnership loans during the period10false 4jnfc_PartnershipLoanOutstandingjnfc_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse-231152000-231152falsefalsefalse2truefalsefalse-170264000-170264falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryTotal partnership loan outstanding.No definition available.false2Total partnership loans outstanding11false 4jnfc_PartnershipCapitalSubjectToMandatoryRedemptionNetOfReserveForAnticipatedWithdrawalsjnfc_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse18106540001810654falsefalsefalse2truefalsefalse18122470001812247falsefalsefalse3truefalsefalse17720120001772012falsefalsefalse4truefalsefalse17583650001758365falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of ownership interest of different classes of partners in limited partnership subject to mandatory redemption, net of reserve for anticipated withdrawals.No definition available.false2Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals12false 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