Supplemental Disclosures for Consolidated Statements of Cash Flows - Reconciliation of Net Income (Loss) to Net Cash Provided by Operating Activities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income (loss)	$ 5,696us-gaap_NetIncomeLoss	$ 51,989us-gaap_NetIncomeLoss	$ (710)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash (used) provided by operating activities
Depreciation	3,268us-gaap_Depreciation	2,776us-gaap_Depreciation	2,827us-gaap_Depreciation
Net amortization of premiums and discounts on securities	2,353	3,882	4,740
Accretion of purchase accounting loan discount	(750)	0	0
Other amortization and accretion	494	(172)	20
Change in loans available for sale, net	1,754	22,189	(20,143)
Provision (recpature) for loan losses, net	(3,486)us-gaap_ProvisionForLoanLossesExpensed	3,188us-gaap_ProvisionForLoanLossesExpensed	10,796us-gaap_ProvisionForLoanLossesExpensed
Deferred tax benefit	0us-gaap_DeferredIncomeTaxExpenseBenefit	(40,552)us-gaap_DeferredIncomeTaxExpenseBenefit	(7)us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on sale of securities	(469)us-gaap_GainLossOnInvestments	(419)us-gaap_GainLossOnInvestments	(7,619)us-gaap_GainLossOnInvestments
Gain on sale of loans	(419)us-gaap_GainLossOnSalesOfConsumerLoans	(455)us-gaap_GainLossOnSalesOfConsumerLoans	(816)us-gaap_GainLossOnSalesOfConsumerLoans
Loss on sale or write down of foreclosed assets	310	1,295	3,548
Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Charge Offs	0sbcf_WriteDownOnLoanAvailableForSale	0sbcf_WriteDownOnLoanAvailableForSale	1,238sbcf_WriteDownOnLoanAvailableForSale
Loss on branch closures and disposition of equipment	4,493us-gaap_GainLossOnDispositionOfAssets	1us-gaap_GainLossOnDispositionOfAssets	774us-gaap_GainLossOnDispositionOfAssets
Stock based employee benefit expense	142	190	196
Earnings on bank owned lif insurance	(252)us-gaap_BankOwnedLifeInsuranceIncome	0us-gaap_BankOwnedLifeInsuranceIncome	0us-gaap_BankOwnedLifeInsuranceIncome
Change in interest receivable	(2,763)	160	861
Change in interest payable	847	(27)	(524)
Change in prepaid expenses	(591)	4,562	2,601
Change in accrued taxes	4,294	(102)	(190)
Change in other assets	2,954	792	(835)
Change in other liabilities	2,660	499	581
Net cash provided (used) by operating activities	21,946	49,852	(2,062)
Supplemental disclosure of non cash investing activities
Fair value adjustment to securities	8,985sbcf_FairValueAdjustmentToSecurities	(21,957)sbcf_FairValueAdjustmentToSecurities	(3,405)sbcf_FairValueAdjustmentToSecurities
Transfers from loans to other real estate owned	4,789	5,087	14,067
Transfers from loans to loans available for sale	0	379	10,321
Matured securities recorded as a receivable	0	0	3,100
Securities principal receivable recorded in other assets	101	159	0
Transfer from securities held for investment to available for sale	0	13,818	0
Transfer from securities available for sale to held for investment	$ 158,781	$ 0	$ 0

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Costs and payments related to employee benefits and equity-based compensation, such as pension expense and contributions, other postretirement benefits expense and payments, stock or unit options expense, and amortization of restricted stock or unit.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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The gains (losses) included in earning that represent the difference between the sale price and the carrying value of consumer loans. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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The increase (decrease) during the reporting period in the amount due from borrowers for interest payments.

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The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.

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The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.

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The increase (decrease) during the reporting period in the value of loans or securitized loans that are held with the intention to sell in the near future.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities.

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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of expense related to loss from loan transactions.

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