Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Amortized Cost, Due in less than one year	$ 0
Held for Investment, Fair Value, Due in less than one year	0
Available for Sale Amortized Cost, Due in less than one year	0
Available for Sale, Fair Value, Due in less than one year	0
Held for Investment, Amortized Cost, Due after one year through five years	0
Held for Investment, Fair Value, Due after one year through five years	0
Available for Sale, Amortized Cost, Due after one year through five years	842
Available for Sale, Fair Value, Due after one year through five years	847
Held for Investment, Amortized Cost, Due after five years through ten years	0
Held for Investment, Fair Value, Due after five years through ten years	0
Available for Sale, Amortized Cost, Due after five years through ten years	24,239
Available for Sale, Fair Value, Due after five years through ten years	24,178
Held for Investment, Amortized Cost, Due after ten years	0
Held for Investment, Fair Value, Due after ten years	0
Available for Sale, Amortized Cost, Due after ten years	129,703
Available for Sale, Fair Value, Due after ten years	128,417
Held for Investment, Amortized Cost, Total	207,904us-gaap_HeldToMaturitySecurities	0us-gaap_HeldToMaturitySecurities
Held for Investment, Fair Value, Total	208,787	0
Available for Sale, Amortized Cost, Total	746,390	658,458
Available for Sale, Fair Value, Total	153,442
Gross Amortized Cost, Held for Investment Securities	207,904	0
Fair value, Held for Investment Securities	208,788sbcf_FairValueHeldToMaturity
Gross Amortized Cost, Available for Sale	746,390	658,458
Fair Value, Available for Sale	741,375
Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Fair Value, Total	68,347	0
Available for Sale, Amortized Cost, Total	123,981	129,468
Gross Amortized Cost, Held for Investment Securities	67,535	0
Fair value, Held for Investment Securities	68,347
Gross Amortized Cost, Available for Sale	123,981	129,468
Fair Value, Available for Sale	125,059
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held for Investment, Fair Value, Total	114,956	0
Available for Sale, Amortized Cost, Total	352,483	383,392
Gross Amortized Cost, Held for Investment Securities	114,541	0
Fair value, Held for Investment Securities	114,956
Gross Amortized Cost, Available for Sale	352,483	383,392
Fair Value, Available for Sale	347,481
Private mortgage backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Total	29,967	29,800
Gross Amortized Cost, Held for Investment Securities	0
Fair value, Held for Investment Securities	0
Gross Amortized Cost, Available for Sale	29,967	29,800
Fair Value, Available for Sale	30,258
Private collateralized mortgage obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Available for Sale, Amortized Cost, Total	85,175	76,520
Gross Amortized Cost, Held for Investment Securities	25,828
Fair value, Held for Investment Securities	25,485
Gross Amortized Cost, Available for Sale	85,175	76,520
Fair Value, Available for Sale	$ 85,135

Available for sale securities debt maturities aggregate fair value.

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Fair value held to maturity.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the fifth through tenth fiscal year following the latest fiscal year.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of held-to-maturity debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)(1)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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