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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-11-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000730708</issuerCik>
        <issuerName>SEACOAST BANKING CORP OF FLORIDA</issuerName>
        <issuerTradingSymbol>SBCF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001078596</rptOwnerCik>
            <rptOwnerName>HUDSON DENNIS S III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>815 COLORADO AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>P O BOX 9012</rptOwnerStreet2>
            <rptOwnerCity>STUART</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>34995-9012</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President &amp; CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-11-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>926</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>23.17</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>39531</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>71610</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1121778</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Held by Sherwood Partners, Ltd., a family partnership</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>24200</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Held by spouse</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Common Stock Right to Buy</value>
                <footnoteId id="F3"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>17.08</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <value>2013-11-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>75000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>75000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Common Stock Right to Buy</value>
                <footnoteId id="F5"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.303</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>1999-02-21</value>
            </exerciseDate>
            <expirationDate>
                <value>2005-02-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>19800</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Common Stock Right to Buy</value>
                <footnoteId id="F6"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>6.5909</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2000-06-18</value>
            </exerciseDate>
            <expirationDate>
                <value>2006-06-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>19800</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Common Stock Right to Buy</value>
                <footnoteId id="F6"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>7.7273</value>
                <footnoteId id="F7"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2001-05-20</value>
            </exerciseDate>
            <expirationDate>
                <value>2007-05-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>19800</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Common Stock Right to Buy</value>
                <footnoteId id="F6"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.7879</value>
                <footnoteId id="F8"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>1999-07-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2008-06-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>72600</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>72600</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">14,000 shares represent unvested shares in a time-based restricted stock award granted under Seacoast's 2000 Long-Term Incentive Plan which shall vest in 3,500 share increments on each anniversary of the date of grant (11/17/03), subject to continued employment. Another 17,500 shares represent a performance based restricted stock award granted under the 2000 Long-Term Incentive Plan which shall vest, subject to continued employment, over a 5-year performance period beginning Jan.1, 2004 as to the following percentage of shares based on the Company's EPS growth over the performance period compared to fiscal year 2003 EPS: 38% EPS growth=25% vesting; 50% EPS growth=50% vesting; 75% EPS growth=75% vesting; 85% EPS growth=100% vesting. In addition, 100% of the performance based award shall vest on the fifth anniversary of the grant date if the Company achieves an ROE of at least 16.5% for 3 consecutive quarters during the performance period, regardless of whether the EPS targets are met.</footnote>
        <footnote id="F2">Held jointly with spouse</footnote>
        <footnote id="F3">Granted pursuant to Seacoast Banking Corporation of Florida's 2000 Long-Term Incentive Plan</footnote>
        <footnote id="F4">Vest over 5 years at the rate of 20% on the first anniversary of the date of grant and then at the rate of 20% on each of the following four anniversaries thereafter subject to continued employment.</footnote>
        <footnote id="F5">Granted pursuant to Seacoast Banking Corporation of Florida's 1991 Stock Option and Stock Appreciation Rights Plan</footnote>
        <footnote id="F6">Granted pursuant to Seacoast Banking Corporation of Florida's 1996 Long-Term Incentive Plan</footnote>
        <footnote id="F7">The Form 4 filing software only allows for numbers to be expressed up to four decimal places.  The actual price of Mr. Hudson's stock options is $7.72727.</footnote>
        <footnote id="F8">The Form 4 filing software only allows for numbers to be expressed up to four decimal places.  The actual price of Mr. Hudson's stock options is $8.787879.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Sharon Mehl as Power of Attorney for Dennis S. Hudson, III</signatureName>
        <signatureDate>2004-11-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0202
4
2004-11-26
0
0000730708
SEACOAST BANKING CORP OF FLORIDA
SBCF
0001078596
HUDSON DENNIS S III
815 COLORADO AVENUE
P O BOX 9012
STUART
FL
34995-9012
1
1
0
0
President & CEO
Common Stock
2004-11-26
4
F
0
926
23.17
D
39531
D
Common Stock
71610
D
Common Stock
1121778
I
Held by Sherwood Partners, Ltd., a family partnership
Common Stock
24200
I
Held by spouse
Common Stock Right to Buy
17.08
2013-11-17
Common Stock
75000
75000
D
Common Stock Right to Buy
5.303
1999-02-21
2005-02-20
Common Stock
19800
19800
D
Common Stock Right to Buy
6.5909
2000-06-18
2006-06-17
Common Stock
19800
19800
D
Common Stock Right to Buy
7.7273
2001-05-20
2007-05-20
Common Stock
19800
19800
D
Common Stock Right to Buy
8.7879
1999-07-01
2008-06-30
Common Stock
72600
72600
D
14,000 shares represent unvested shares in a time-based restricted stock award granted under Seacoast's 2000 Long-Term Incentive Plan which shall vest in 3,500 share increments on each anniversary of the date of grant (11/17/03), subject to continued employment. Another 17,500 shares represent a performance based restricted stock award granted under the 2000 Long-Term Incentive Plan which shall vest, subject to continued employment, over a 5-year performance period beginning Jan.1, 2004 as to the following percentage of shares based on the Company's EPS growth over the performance period compared to fiscal year 2003 EPS: 38% EPS growth=25% vesting; 50% EPS growth=50% vesting; 75% EPS growth=75% vesting; 85% EPS growth=100% vesting. In addition, 100% of the performance based award shall vest on the fifth anniversary of the grant date if the Company achieves an ROE of at least 16.5% for 3 consecutive quarters during the performance period, regardless of whether the EPS targets are met.
Held jointly with spouse
Granted pursuant to Seacoast Banking Corporation of Florida's 2000 Long-Term Incentive Plan
Vest over 5 years at the rate of 20% on the first anniversary of the date of grant and then at the rate of 20% on each of the following four anniversaries thereafter subject to continued employment.
Granted pursuant to Seacoast Banking Corporation of Florida's 1991 Stock Option and Stock Appreciation Rights Plan
Granted pursuant to Seacoast Banking Corporation of Florida's 1996 Long-Term Incentive Plan
The Form 4 filing software only allows for numbers to be expressed up to four decimal places.  The actual price of Mr. Hudson's stock options is $7.72727.
The Form 4 filing software only allows for numbers to be expressed up to four decimal places.  The actual price of Mr. Hudson's stock options is $8.787879.
Sharon Mehl as Power of Attorney for Dennis S. Hudson, III
2004-11-26