Contingent Liabilities and Commitments with Off-Balance Sheet Risk - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit amount	$ 1,018,020	$ 982,739
Unfunded limited partner equity commitment	$ 6,011	7,252
Minimum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit fixed interest rate	3.24%
Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitment to extend credit fixed interest rate	6.50%
Fixed Interest Rate Credit Risk
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commitments to extend credit	$ 39,400
Secured Credit Risk
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Secured amount of commitment to extend credit	399,700
Secured
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Collateral held for secured standby letters of credit	$ 13,200	$ 19,100

Commitment to extend credit amount.

No definition available.

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Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Commitment to extend credit amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbcf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Commitment to extend credit secured amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Unfunded limited partner equity commitment.

+ References

No definition available.

+ Details

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Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 10
-Section 05
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=109246787&loc=d3e93645-111703

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Balance Type:	debit
Period Type:	instant

- Details

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- Details

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- Details

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