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Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015
Issuance of stock, shares	110,167us-gaap_StockIssuedDuringPeriodSharesNewIssues
Pursuant to dividend reinvestment plan, shares	42,975us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Exercise of employee stock options and issuance of directors' deferred stock, shares	67,192us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Issuance of partnership units, shares	20,796bfs_PartnershipUnitsIssuedDuringPeriod
Distributions payable common stock, per share (in usd per share)	$ 0.43us-gaap_CommonStockDividendsPerShareDeclared
Dividend Declared
Distributions payable common stock, per share (in usd per share)	$ 0.43us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember
Distributions partnership units, per unit (in usd per unit)	$ 0.43us-gaap_DistributionsPerLimitedPartnershipUnitOutstanding / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember
Series C Preferred Stock | Dividend Declared
Preferred stock, per share (in usd per share)	$ 42.97us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember

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Partnership Units Issued During Period

+ References

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.3-04)



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Cash dividends declared or paid to each outstanding limited partnership unit during the reporting period.

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-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section S99



-Paragraph 5



-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770







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-Publisher SEC



-Name Staff Accounting Bulletin (SAB)



-Number Topic 4



-Section F

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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