<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4/A</documentType><periodOfReport>2002-10-28</periodOfReport><dateOfOriginalSubmission>2002-10-29</dateOfOriginalSubmission>
    <issuer>
        <issuerCik>0000856223</issuerCik>
        <issuerName>SUMMIT FINANCIAL CORP</issuerName>
        <issuerTradingSymbol>SUMM</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001184113</rptOwnerCik>
            <rptOwnerName>BROWN C VINCENT</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>37 ROCKY CREEK LANE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>GREENVILLE</rptOwnerCity>
            <rptOwnerState>SC</rptOwnerState>
            <rptOwnerZipCode>29615</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Summit Financial Corporation Common Stock</value></securityTitle><transactionDate><value>2002-10-28</value></transactionDate><deemedExecutionDate><value>2002-10-28</value></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>P</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>629</value></transactionShares><transactionPricePerShare><value>16.15</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>86015</value><footnoteId id="F1"/><footnoteId id="F2"/></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><footnotes><footnote id="F1">Reporting person also owns 51,691 shares Indirectly, consisting of 34,119 shares held by a related company and 17,572 shares held by spouse</footnote><footnote id="F2">Reporting person also owns 5,910 stock options at an exercise price of $3.98, exercisable 1/5/96 which expire 1/5/2005 and 53,188 stock options at an exercise price of $5.33, exercisable in annual increments of 11.1% beginning 1/1/97 which expire 1/1/2006</footnote></footnotes><remarks/><ownerSignature><signatureName>C. Vincent Brown, by Blaise B. Bettendorf, Attorney-in-fact</signatureName><signatureDate>2002-10-28</signatureDate></ownerSignature></ownershipDocument>

