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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-12-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001200660</rptOwnerCik>
            <rptOwnerName>HAHL WILLIAM R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>P. O. BOX 9012</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>STUART</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>34995</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Exec VP &amp; Chief Financial Offi</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-12-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1100</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>21525</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-12-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1100</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <valueOwnedFollowingTransaction>
                    <value>22625</value>
                    <footnoteId id="F2"/>
                </valueOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>264</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>As Custodian for Granddaughters</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Common Stock - Right to Buy</value>
                <footnoteId id="F4"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>22.4</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2004-12-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>22.4</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-12-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <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</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>13200</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13200</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</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>13200</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13200</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</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>23100</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>23100</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Common Stock - Right to Buy</value>
                <footnoteId id="F4"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>17.08</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F9"/>
            </exerciseDate>
            <expirationDate>
                <value>2013-11-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>13000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents a restricted stock award granted under Seacoast's 2000 Long-Term Incentive Plan which shall vest over 5 years at the rate of 20% on the first anniversary of the date of grant (12/21/04) and then at the rate of 20% on each of the following four anniversaries, subject to continued employment.</footnote>
        <footnote id="F2">2,640 shares represent unvested shares in a time-based restricted stock award granted under Seacoast's 2000 Long-Term Incentive Plan which shall vest in 660 share increments on each anniversary of the date of grant (11/17/03), subject to continued employment.  Another 3,300 shares represent a performance based restricted stock award granted under Seacoast's 2000 Plan which shall vest, subject to continued employment, over a 5-year performance period beginning 1/1/04 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. Notwithstanding the above schedule, 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="F3">Represents restricted stock award granted under Seacoast's 2000 Long-Term Incentive Plan which shall vest, subject to continued employment, over a 5-year performance period beginning January 1, 2005 as to the following percentage of shares based on the Company's EPS growth over the performance period compared to fiscal year 2004 EPS: 38% EPS growth=25% vesting, 50% EPS growth=50% vesting; 75% EPS growth=75% vesting; 85% EPS growth=100% vesting. Notwithstanding the above, 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="F4">Granted pursuant to Seacoast Banking Corporation of Florida's 2000 Long-Term Incentive Plan.</footnote>
        <footnote id="F5">Vests over 5 years at the rate of 20% on the first anniversary of the date of grant (12/21/04) and then at the rate of 20% on each of the following four anniversaries thereafter, subject to continued employment.</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. Hahl'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. Hahl's stock options is $8.787879.</footnote>
        <footnote id="F9">Vests over 5 years at the rate of 20% on the first anniversary of the date of grant (11/17/03) and then at the rate of 20% on each of the following four anniversaries thereafter, subject to continued employment.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Sharon Mehl as power of attorney for William R. Hahl</signatureName>
        <signatureDate>2004-12-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0202
4
2004-12-21
0
0000730708
SEACOAST BANKING CORP OF FLORIDA
sbcf
0001200660
HAHL WILLIAM R
P. O. BOX 9012
STUART
FL
34995
0
1
0
0
Exec VP & Chief Financial Offi
Common Stock
2004-12-21
4
A
0
1100
0
A
21525
D
Common Stock
2004-12-21
4
A
0
1100
0
A
22625
D
Common Stock
264
I
As Custodian for Granddaughters
Common Stock - Right to Buy
22.4
2004-12-21
4
A
0
5000
22.4
A
2014-12-21
Common
5000
5000
D
Common Stock - Right to Buy
6.5909
2000-06-18
2006-06-17
Common
13200
13200
D
Common Stock - Right to Buy
7.7273
2001-05-20
2007-05-20
Common
13200
13200
D
Common Stock - Right to Buy
8.7879
1999-07-01
2008-06-30
Common
23100
23100
D
Common Stock - Right to Buy
17.08
2013-11-17
Common
13000
13000
D
Represents a restricted stock award granted under Seacoast's 2000 Long-Term Incentive Plan which shall vest over 5 years at the rate of 20% on the first anniversary of the date of grant (12/21/04) and then at the rate of 20% on each of the following four anniversaries, subject to continued employment.
2,640 shares represent unvested shares in a time-based restricted stock award granted under Seacoast's 2000 Long-Term Incentive Plan which shall vest in 660 share increments on each anniversary of the date of grant (11/17/03), subject to continued employment.  Another 3,300 shares represent a performance based restricted stock award granted under Seacoast's 2000 Plan which shall vest, subject to continued employment, over a 5-year performance period beginning 1/1/04 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. Notwithstanding the above schedule, 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.
Represents restricted stock award granted under Seacoast's 2000 Long-Term Incentive Plan which shall vest, subject to continued employment, over a 5-year performance period beginning January 1, 2005 as to the following percentage of shares based on the Company's EPS growth over the performance period compared to fiscal year 2004 EPS: 38% EPS growth=25% vesting, 50% EPS growth=50% vesting; 75% EPS growth=75% vesting; 85% EPS growth=100% vesting. Notwithstanding the above, 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.
Granted pursuant to Seacoast Banking Corporation of Florida's 2000 Long-Term Incentive Plan.
Vests over 5 years at the rate of 20% on the first anniversary of the date of grant (12/21/04) 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 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. Hahl'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. Hahl's stock options is $8.787879.
Vests over 5 years at the rate of 20% on the first anniversary of the date of grant (11/17/03) and then at the rate of 20% on each of the following four anniversaries thereafter, subject to continued employment.
Sharon Mehl as power of attorney for William R. Hahl
2004-12-23