<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-02-15</periodOfReport>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0001265131</issuerCik>
        <issuerName>Hilltop Holdings Inc.</issuerName>
        <issuerTradingSymbol>HTH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001683821</rptOwnerCik>
            <rptOwnerName>Furr William B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6565 HILLCREST AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75205</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-02-15</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>983.00</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>22.24</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>69826.00</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of common stock of Hilltop Holdings Inc. (the &quot;Issuer&quot;) withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of 3,315 restricted stock units granted to the reporting person on September 6, 2016.</footnote>
        <footnote id="F2">Also includes 6,154 restricted stock units that will vest, and an equal number of shares of common stock that will be deliverable to the reporting person, upon the third anniversary of the date of grant, February 23, 2020, or immediately upon the earlier occurrence of events specified in the reporting person's restricted stock unit award agreement, including a &quot;change in control&quot; of the Issuer. The shares of common stock deliverable upon conversion of the 6,154 restricted stock units will be subject to restrictions on transfer until the first anniversary of the vesting date of the restricted stock units, February 23, 2021, or an earlier &quot;change in control&quot; of the Issuer.</footnote>
        <footnote id="F3">Also includes 7,753 restricted stock units that will vest, and an equal number of shares of common stock that will be deliverable to the reporting person, upon the third anniversary of the date of grant, March 5, 2021, or immediately upon the earlier occurrence of events specified in the reporting person's restricted stock unit award agreement, including a &quot;change in control&quot; of the Issuer. The shares of common stock deliverable upon conversion of the 7,753 restricted stock units will be subject to restrictions on transfer until the first anniversary of the applicable vesting date of the restricted stock units, March 5, 2022, or an earlier &quot;change in control&quot; of the Issuer.</footnote>
        <footnote id="F4">Also includes 11,358 restricted stock units that will vest, and an equal number of shares of common stock that will be deliverable to the reporting person, upon the third anniversary of the date of grant, February 27, 2022, or immediately upon the earlier occurrence of events specified in the reporting person's restricted stock unit award agreement. The shares of common stock deliverable upon conversion of the 11,358 restricted stock units will be subject to restrictions on transfer until the first anniversary of the applicable vesting date of the restricted stock units, February 27, 2023, or immediately upon the earlier occurrence of events specified in the reporting person's restricted stock unit award agreement</footnote>
        <footnote id="F5">Also includes 13,600 restricted stock units that will vest, and an equal number of shares of common stock that will be deliverable to the reporting person, upon the third anniversary of the date of grant, September 5, 2022, or immediately upon the earlier occurrence of events specified in the reporting person's restricted stock unit award agreement. The shares of common stock deliverable upon conversion of the 13,600 restricted stock units will be subject to restrictions on transfer until the first anniversary of the applicable vesting date of the restricted stock units, September 5, 2023, or immediately upon the earlier occurrence of events specified in the reporting person's restricted stock unit award agreement.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ WILLIAM B. FURR</signatureName>
        <signatureDate>2020-02-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
