    <SEC-DOCUMENT>0000923139-21-000047-index.html : 20211027
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    <ACCEPTANCE-DATETIME>20211026174146
    ACCESSION NUMBER:		0000923139-21-000047
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		15
    CONFORMED PERIOD OF REPORT:	20211026
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20211027
    DATE AS OF CHANGE:		20211026

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			FLUSHING FINANCIAL CORP
    		CENTRAL INDEX KEY:			0000923139
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				113209278
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33013
    		FILM NUMBER:		211349883

    	BUSINESS ADDRESS:
    		STREET 1:		220 RXR PLAZA
    		CITY:			UNIONDALE
    		STATE:			NY
    		ZIP:			11556
    		BUSINESS PHONE:		718-961-5400

    	MAIL ADDRESS:
    		STREET 1:		220 RXR PLAZA
    		CITY:			UNIONDALE
    		STATE:			NY
    		ZIP:			11556
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    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>ffic-20211026x8k.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: ffic-20211026x8k.htm

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    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>ffic-20211026ex99146efa4.htm
    <DESCRIPTION>EX-99.1
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    Document 2 - file: ffic-20211026ex99146efa4.htm

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    <TYPE>EX-99.1
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    <FILENAME>ffic-20211026ex99146ada0.pdf
    <DESCRIPTION>EX-99.1
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    <FILENAME>ffic-20211026ex99146efa4002.jpg
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    <TEXT>
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    <DOCUMENT>
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    <FILENAME>ffic-20211026.xsd
    <DESCRIPTION>EX-101.SCH
    <TEXT>
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    <DESCRIPTION>EX-101.LAB
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    <SEQUENCE>7
    <FILENAME>ffic-20211026_pre.xml
    <DESCRIPTION>EX-101.PRE
    <TEXT>
    Document 7 - file: ffic-20211026_pre.xml

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    <TEXT>
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    <TYPE>EXCEL
    <SEQUENCE>10
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    <TEXT>
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    <TYPE>XML
    <SEQUENCE>11
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    <SEQUENCE>12
    <FILENAME>report.css
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    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>13
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <TYPE>JSON
    <SEQUENCE>15
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    <TEXT>
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    <TYPE>ZIP
    <SEQUENCE>16
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    <TEXT>
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