    <SEC-DOCUMENT>0000717538-22-000077-index.html : 20220228
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    <ACCEPTANCE-DATETIME>20220228111622
    ACCESSION NUMBER:		0000717538-22-000077
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		30
    CONFORMED PERIOD OF REPORT:	20220228
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20220228
    DATE AS OF CHANGE:		20220228

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ARROW FINANCIAL CORP
    		CENTRAL INDEX KEY:			0000717538
    		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
    		IRS NUMBER:				222448962
    		STATE OF INCORPORATION:			NY
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-12507
    		FILM NUMBER:		22685375

    	BUSINESS ADDRESS:
    		STREET 1:		250 GLEN ST
    		CITY:			GLENS FALLS
    		STATE:			NY
    		ZIP:			12801
    		BUSINESS PHONE:		5184154299

    	MAIL ADDRESS:
    		STREET 1:		250 GLEN STREET
    		CITY:			GLENS FALLS
    		STATE:			NY
    		ZIP:			12801

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ARROW BANK CORP
    		DATE OF NAME CHANGE:	19900710
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>arow-20220228.htm
    <DESCRIPTION>8-K
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    Document 1 - file: arow-20220228.htm

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    <FILENAME>a2021ar.htm
    <DESCRIPTION>EX-99
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    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
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    Document 3 - file: arow-20220228.xsd

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    <SEQUENCE>30
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