2.4.0.8040 - Disclosure - Note 4 - Debt and Equity Securities (Details) - Trust preferred issues:truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$c0_AsOf30Jun2013http://www.sec.gov/CIK0000923139instant2013-06-30T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$c1_AsOf31Dec2012http://www.sec.gov/CIK0000923139instant2012-12-31T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDtruefalsec135_From1Jan2013To30Jun2013_SingleIssuerMemberhttp://www.sec.gov/CIK0000923139duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseSingle Issuer [Member]invest_InvestmentIssuerAxisxbrldihttp://xbrl.org/2006/xbrldiffic_SingleIssuerMemberinvest_InvestmentIssuerAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$4false USDtruefalsec137_From1Jan2013To30Jun2013_PooledIssuer1Memberhttp://www.sec.gov/CIK0000923139duration2013-01-01T00:00:002013-06-30T00:00:00falsefalsePooled Issuer 1 [Member]invest_InvestmentIssuerAxisxbrldihttp://xbrl.org/2006/xbrldiffic_PooledIssuer1Memberinvest_InvestmentIssuerAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$5false USDtruefalsec139_From1Jan2013To30Jun2013_PooledIssuer2Memberhttp://www.sec.gov/CIK0000923139duration2013-01-01T00:00:002013-06-30T00:00:00falsefalsePooled Issuer 2 [Member]invest_InvestmentIssuerAxisxbrldihttp://xbrl.org/2006/xbrldiffic_PooledIssuer2Memberinvest_InvestmentIssuerAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$6false USDtruefalse$c140_AsOf30Jun2013_PooledTrustPreferredSecuritiesMemberhttp://www.sec.gov/CIK0000923139instant2013-06-30T00:00:000001-01-01T00:00:00falsefalsePooled Trust Preferred Securities [Member]us-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldiffic_PooledTrustPreferredSecuritiesMemberus-gaap_InvestmentTypeAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Schedule of Available-for-sale Securities [Line Items]2false 4ffic_TrustPreferredSecuritiesClassffic_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00n/afalsefalsefalse4falsefalsefalse00B1falsefalsefalse5falsefalsefalse00C1falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringRepresents the class of the trust preferred securities.No definition available.false0Class3false 4ffic_PerformingBanksffic_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse11falsefalsefalse4truefalsefalse1717falsefalsefalse5truefalsefalse1616falsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:integerItemTypeintegerNumber of performing banksNo definition available.false0Performing Banks4false 4us-gaap_AvailableForSaleSecuritiesAmortizedCostus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse10418340001041834USD$falsetruefalse2truefalsefalse915947000915947USD$falsetruefalse3truefalsefalse300000300USD$falsetruefalse4truefalsefalse56170005617USD$falsetruefalse5truefalsefalse36450003645USD$falsetruefalse6truefalsefalse95620009562USD$falsetruefalsexbrli:monetaryItemTypemonetaryThis item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 false2Amortized Cost5false 4us-gaap_AvailableForSaleSecuritiesus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10407230001040723falsefalsefalse2truefalsefalse949566000949566falsefalsefalse3truefalsefalse291000291falsefalsefalse4truefalsefalse32800003280falsefalsefalse5truefalsefalse27000002700falsefalsefalse6truefalsefalse62710006271falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 false2Fair Value6false 4ffic_CumulativeCreditRelatedOTTIffic_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse21960002196USD$falsetruefalse5truefalsefalse15420001542USD$falsetruefalse6truefalsefalse37380003738USD$falsetruefalsexbrli:monetaryItemTypemonetaryCumulative Credit Related OTTINo definition available.false2Cumulative Credit Related OTTI7false 4ffic_DeferralsDefaultsActualAsAPercentageOfOriginalSecurityffic_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00  [1]falsefalsefalse4truetruefalse0.2480.248[1]falsefalsefalse5truetruefalse0.2130.213[1]falsefalsefalse6falsetruefalse00falsefalsefalsenum:percentItemTypepureDeferrals/Defaults, Actual as a Percentage of Original SecurityNo definition available.false0Deferrals/Defaults, Actual as a Percentage of Original Security8false 4ffic_DeferralsDefaultsExpectedPercentageOfPerformingCollateralffic_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3falsetruefalse00  [1]falsefalsefalse4truetruefalse0.0000.000[1]falsefalsefalse5truetruefalse0.0000.000[1]falsefalsefalse6falsetruefalse00falsefalsefalsenum:percentItemTypepureDeferrals/Defaults, Expected Percentage of Performing CollateralNo definition available.false0Deferrals/Defaults, Expected Percentage of Performing Collateral9false 4ffic_CurrentLowestRatingffic_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00BB-falsefalsefalse4falsefalsefalse00Cfalsefalsefalse5falsefalsefalse00Cfalsefalsefalse6falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringCurrent lowest rating.No definition available.false0Current Lowest Rating1Represents deferrals/defaults as a percentage of the original security and expected deferrals/defaults as a percentage of performing issuers.falseNote 4 - Debt and Equity Securities (Details) - Trust preferred issues: (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://flushingbank.com/role/TrustpreferredissuesTable69