XML 29 R50.htm IDEA: XBRL DOCUMENT v2.4.1.9

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Additional Information) (Detail) (USD $)	0 Months Ended						12 Months Ended		0 Months Ended
	Apr. 26, 2012	Feb. 27, 2013	Apr. 11, 2012	Mar. 19, 2013	May 28, 2013	Oct. 25, 2013	Dec. 31, 2014		Sep. 04, 2013	Dec. 31, 2013	Dec. 31, 2012
Notes Payable [Line Items]
Interest rate							3.65%us-gaap_DebtInstrumentInterestRateEffectivePercentage			4.85%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Line of credit facility, maximum borrowing capacity							$ 231,600,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
White Oak Shopping Center
Notes Payable [Line Items]
Amortization period	25 years
Debt instrument final payment	18,500,000bfs_DebtInstrumentFinalPaymentAmount / bfs_RealEstatePropertyNameAxis = bfs_WhiteOakShoppingCenterMember
Debt instrument amount	10,500,000us-gaap_DebtInstrumentFaceAmount / bfs_RealEstatePropertyNameAxis = bfs_WhiteOakShoppingCenterMember
Northrock
Notes Payable [Line Items]
Amortization period		25 years
Debt instrument final payment		14,200,000bfs_DebtInstrumentFinalPaymentAmount / bfs_RealEstatePropertyNameAxis = bfs_NorthrockMember
Debt instrument amount		15,000,000us-gaap_DebtInstrumentFaceAmount / bfs_RealEstatePropertyNameAxis = bfs_NorthrockMember
Interest rate spread on LIBOR		1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / bfs_RealEstatePropertyNameAxis = bfs_NorthrockMember
Metro Pike Center
Notes Payable [Line Items]
Amortization period		25 years
Debt instrument final payment		14,800,000bfs_DebtInstrumentFinalPaymentAmount / bfs_RealEstatePropertyNameAxis = bfs_MetroPikeCenterMember
Debt instrument amount		15,600,000us-gaap_DebtInstrumentFaceAmount / bfs_RealEstatePropertyNameAxis = bfs_MetroPikeCenterMember
Interest rate spread on LIBOR		1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / bfs_RealEstatePropertyNameAxis = bfs_MetroPikeCenterMember
5.84% due May 2027 | Seven Corners
Notes Payable [Line Items]
Amortization period			25 years
Debt instrument amount			73,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember / bfs_RealEstatePropertyNameAxis = bfs_SevenCornersMember
4.04% due April 2028 | Hampshire Langley
Notes Payable [Line Items]
Principal and interest payments				95,400us-gaap_DebtInstrumentPeriodicPayment / us-gaap_LongtermDebtTypeAxis = bfs_FourPointZeroFourMaturingAprilTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_HampshireLangleyMember
Debt instrument final payment				9,500,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_LongtermDebtTypeAxis = bfs_FourPointZeroFourMaturingAprilTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_HampshireLangleyMember
Debt instrument amount				18,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bfs_FourPointZeroFourMaturingAprilTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_HampshireLangleyMember
3.51% due June 2028 | Beacon Center
Notes Payable [Line Items]
Principal and interest payments					203,200us-gaap_DebtInstrumentPeriodicPayment / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointFiveOneMaturingJuneTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_BeaconCenterMember
Amortization period					20 years
Debt instrument final payment					11,400,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointFiveOneMaturingJuneTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_BeaconCenterMember
Debt instrument amount					35,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointFiveOneMaturingJuneTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_BeaconCenterMember
3.99% due September 2028 | Seabreeze Plaza
Notes Payable [Line Items]
Debt instrument amount									18,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointNineNineMaturingSeptemberTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_SeabreezePlazaMember
4.88% due September 2032 | Park Van Ness
Notes Payable [Line Items]
Amortization period						25 years
Fixed Rate Mortgage Notes Payable
Notes Payable [Line Items]
Interest rate							5.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember	[1]
Fixed Rate Mortgage Notes Payable | White Oak Shopping Center
Notes Payable [Line Items]
Interest rate	4.90%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / bfs_RealEstatePropertyNameAxis = bfs_WhiteOakShoppingCenterMember
Fixed Rate Mortgage Notes Payable | 7.45% due June 2015
Notes Payable [Line Items]
Interest rate							7.45%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointFourFiveMaturingJuneTwentyFifteenMember
Fixed Rate Mortgage Notes Payable | 7.45% due June 2015 | Shops at Fairfax and Boulevard
Notes Payable [Line Items]
Principal and interest payments							156,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointFourFiveMaturingJuneTwentyFifteenMember / bfs_RealEstatePropertyNameAxis = bfs_ShopsatFairfaxandBoulevardMember
Amortization period							23 years
Debt instrument final payment							15,200,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointFourFiveMaturingJuneTwentyFifteenMember / bfs_RealEstatePropertyNameAxis = bfs_ShopsatFairfaxandBoulevardMember
Amortization of principal							729,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointFourFiveMaturingJuneTwentyFifteenMember / bfs_RealEstatePropertyNameAxis = bfs_ShopsatFairfaxandBoulevardMember
Fixed Rate Mortgage Notes Payable | 6.01% due February 2018
Notes Payable [Line Items]
Interest rate							6.01%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroOneMaturingFebruaryTwentyEighteenMember
Fixed Rate Mortgage Notes Payable | 6.01% due February 2018 | Washington Square
Notes Payable [Line Items]
Principal and interest payments							264,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroOneMaturingFebruaryTwentyEighteenMember / bfs_RealEstatePropertyNameAxis = bfs_WashingtonSquareMember
Amortization period							27 years 6 months
Debt instrument final payment							28,000,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroOneMaturingFebruaryTwentyEighteenMember / bfs_RealEstatePropertyNameAxis = bfs_WashingtonSquareMember
Amortization of principal							1,200,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroOneMaturingFebruaryTwentyEighteenMember / bfs_RealEstatePropertyNameAxis = bfs_WashingtonSquareMember
Fixed Rate Mortgage Notes Payable | 5.88% due January 2019
Notes Payable [Line Items]
Interest rate							5.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightEightMaturingJanuaryTwentyNineteenMember
Fixed Rate Mortgage Notes Payable | 5.88% due January 2019 | Broadlands Village, The Glen and Kentlands Square I
Notes Payable [Line Items]
Principal and interest payments							306,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightEightMaturingJanuaryTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_BroadlandsVillageTheGlenandKentlandsSquareIMember
Amortization period							25 years
Debt instrument final payment							28,400,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightEightMaturingJanuaryTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_BroadlandsVillageTheGlenandKentlandsSquareIMember
Amortization of principal							1,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightEightMaturingJanuaryTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_BroadlandsVillageTheGlenandKentlandsSquareIMember
Number of shopping centers							3bfs_NumberOfShoppingCenters / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightEightMaturingJanuaryTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_BroadlandsVillageTheGlenandKentlandsSquareIMember
Fixed Rate Mortgage Notes Payable | 5.76% due May 2019
Notes Payable [Line Items]
Interest rate							5.76%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSevenSixMaturingMayTwentyNineteenMember
Fixed Rate Mortgage Notes Payable | 5.76% due May 2019 | Olde Forte Village
Notes Payable [Line Items]
Principal and interest payments							98,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSevenSixMaturingMayTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_OldeForteVillageMember
Amortization period							25 years
Debt instrument final payment							9,000,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSevenSixMaturingMayTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_OldeForteVillageMember
Amortization of principal							495,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSevenSixMaturingMayTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_OldeForteVillageMember
Fixed Rate Mortgage Notes Payable | 5.62% due July 2019
Notes Payable [Line Items]
Interest rate							5.62%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixTwoMaturingJulyTwentyNineteenMember
Fixed Rate Mortgage Notes Payable | 5.62% due July 2019 | Countryside
Notes Payable [Line Items]
Principal and interest payments							133,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixTwoMaturingJulyTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_CountrysideMember
Amortization period							25 years
Debt instrument final payment							12,300,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixTwoMaturingJulyTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_CountrysideMember
Amortization of principal							682,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixTwoMaturingJulyTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_CountrysideMember
Fixed Rate Mortgage Notes Payable | 5.79% due September 2019
Notes Payable [Line Items]
Interest rate							5.79%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSevenNineMaturingSeptemberTwentyNineteenMember
Fixed Rate Mortgage Notes Payable | 5.79% due September 2019 | Briggs Chancy MarketPlace
Notes Payable [Line Items]
Principal and interest payments							133,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSevenNineMaturingSeptemberTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_BriggsChancyMarketPlaceMember
Amortization period							25 years
Debt instrument final payment							12,200,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSevenNineMaturingSeptemberTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_BriggsChancyMarketPlaceMember
Amortization of principal							658,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSevenNineMaturingSeptemberTwentyNineteenMember / bfs_RealEstatePropertyNameAxis = bfs_BriggsChancyMarketPlaceMember
Fixed Rate Mortgage Notes Payable | 5.22% due January 2020
Notes Payable [Line Items]
Interest rate							5.22%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointTwoTwoMaturingJanuaryTwentyTwentyMember
Fixed Rate Mortgage Notes Payable | 5.22% due January 2020 | Shops at Monocacy
Notes Payable [Line Items]
Principal and interest payments							112,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointTwoTwoMaturingJanuaryTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_ShopsatMonocacyMember
Amortization period							25 years
Debt instrument final payment							10,600,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointTwoTwoMaturingJanuaryTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_ShopsatMonocacyMember
Amortization of principal							596,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointTwoTwoMaturingJanuaryTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_ShopsatMonocacyMember
Fixed Rate Mortgage Notes Payable | 5.60% due May 2020
Notes Payable [Line Items]
Interest rate							5.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixZeroMaturingMayTwentyTwentyMember
Fixed Rate Mortgage Notes Payable | 5.60% due May 2020 | Boca Valley Plaza
Notes Payable [Line Items]
Principal and interest payments							75,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixZeroMaturingMayTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_BocaValleyPlazaMember
Amortization period							30 years
Debt instrument final payment							9,100,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixZeroMaturingMayTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_BocaValleyPlazaMember
Amortization of principal							278,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixZeroMaturingMayTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_BocaValleyPlazaMember
Fixed Rate Mortgage Notes Payable | 5.30% due June 2020
Notes Payable [Line Items]
Interest rate							5.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointThreeZeroMaturingJuneTwentyTwentyMember
Fixed Rate Mortgage Notes Payable | 5.30% due June 2020 | Palm Springs Center
Notes Payable [Line Items]
Principal and interest payments							75,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointThreeZeroMaturingJuneTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_PalmSpringsCenterMember
Amortization period							25 years
Debt instrument final payment							7,100,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointThreeZeroMaturingJuneTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_PalmSpringsCenterMember
Amortization of principal							386,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointThreeZeroMaturingJuneTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_PalmSpringsCenterMember
Fixed Rate Mortgage Notes Payable | 5.83% due July 2020
Notes Payable [Line Items]
Interest rate							5.83%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightThreeMaturingJulyTwentyTwentyMember
Fixed Rate Mortgage Notes Payable | 5.83% due July 2020 | Thruway
Notes Payable [Line Items]
Principal and interest payments							289,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightThreeMaturingJulyTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_ThruwayMember
Amortization period							25 years
Debt instrument final payment							34,800,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightThreeMaturingJulyTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_ThruwayMember
Amortization of principal							1,021,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightThreeMaturingJulyTwentyTwentyMember / bfs_RealEstatePropertyNameAxis = bfs_ThruwayMember
Fixed Rate Mortgage Notes Payable | 5.81% due February 2021
Notes Payable [Line Items]
Interest rate							5.81%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightOneMaturingFebruaryTwentyTwentyOneMember
Fixed Rate Mortgage Notes Payable | 5.81% due February 2021 | Jamestown Place
Notes Payable [Line Items]
Principal and interest payments							66,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightOneMaturingFebruaryTwentyTwentyOneMember / bfs_RealEstatePropertyNameAxis = bfs_JamestownPlaceMember
Amortization period							25 years
Debt instrument final payment							6,100,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightOneMaturingFebruaryTwentyTwentyOneMember / bfs_RealEstatePropertyNameAxis = bfs_JamestownPlaceMember
Amortization of principal							303,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightOneMaturingFebruaryTwentyTwentyOneMember / bfs_RealEstatePropertyNameAxis = bfs_JamestownPlaceMember
Fixed Rate Mortgage Notes Payable | 6.01% due August 2021
Notes Payable [Line Items]
Interest rate							6.01%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroOneMaturingAugustTwentyTwentyOneMember
Fixed Rate Mortgage Notes Payable | 6.01% due August 2021 | Hunt Club Corners
Notes Payable [Line Items]
Principal and interest payments							42,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroOneMaturingAugustTwentyTwentyOneMember / bfs_RealEstatePropertyNameAxis = bfs_HuntClubCornersMember
Amortization period							30 years
Debt instrument final payment							5,000,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroOneMaturingAugustTwentyTwentyOneMember / bfs_RealEstatePropertyNameAxis = bfs_HuntClubCornersMember
Amortization of principal							133,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroOneMaturingAugustTwentyTwentyOneMember / bfs_RealEstatePropertyNameAxis = bfs_HuntClubCornersMember
Fixed Rate Mortgage Notes Payable | 5.62% due June 2022
Notes Payable [Line Items]
Interest rate							5.62%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixTwoMaturingJuneTwentyTwentyTwoMember
Fixed Rate Mortgage Notes Payable | 5.62% due June 2022 | Landsowne Town Center
Notes Payable [Line Items]
Principal and interest payments							230,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixTwoMaturingJuneTwentyTwentyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_LandsowneTownCenterMember
Amortization period							30 years
Debt instrument final payment							28,200,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixTwoMaturingJuneTwentyTwentyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_LandsowneTownCenterMember
Amortization of principal							759,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointSixTwoMaturingJuneTwentyTwentyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_LandsowneTownCenterMember
Fixed Rate Mortgage Notes Payable | 6.08% due September 2022
Notes Payable [Line Items]
Interest rate							6.08%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroEightMaturingSeptemberTwentyTwentyTwoMember
Fixed Rate Mortgage Notes Payable | 6.08% due September 2022 | Orchard Park
Notes Payable [Line Items]
Principal and interest payments							73,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroEightMaturingSeptemberTwentyTwentyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_OrchardParkMember
Amortization period							30 years
Debt instrument final payment							8,600,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroEightMaturingSeptemberTwentyTwentyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_OrchardParkMember
Amortization of principal							212,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointZeroEightMaturingSeptemberTwentyTwentyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_OrchardParkMember
Fixed Rate Mortgage Notes Payable | 6.43% due April 2023
Notes Payable [Line Items]
Interest rate							6.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointFourThreeMaturingAprilTwentyTwentyThreeMember
Fixed Rate Mortgage Notes Payable | 6.43% due April 2023 | BJs Wholesale
Notes Payable [Line Items]
Principal and interest payments							80,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointFourThreeMaturingAprilTwentyTwentyThreeMember / bfs_RealEstatePropertyNameAxis = bfs_BJsWholesaleMember
Amortization period							30 years
Debt instrument final payment							9,300,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointFourThreeMaturingAprilTwentyTwentyThreeMember / bfs_RealEstatePropertyNameAxis = bfs_BJsWholesaleMember
Amortization of principal							208,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointFourThreeMaturingAprilTwentyTwentyThreeMember / bfs_RealEstatePropertyNameAxis = bfs_BJsWholesaleMember
Fixed Rate Mortgage Notes Payable | 6.28% due February 2024
Notes Payable [Line Items]
Interest rate							6.28%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointTwoEightMaturingFebruaryTwentyTwentyFourMember
Fixed Rate Mortgage Notes Payable | 6.28% due February 2024 | Great Falls Shopping Center
Notes Payable [Line Items]
Principal and interest payments							138,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointTwoEightMaturingFebruaryTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_GreatFallsShoppingCenterMember
Amortization period							26 years
Debt instrument final payment							6,300,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointTwoEightMaturingFebruaryTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_GreatFallsShoppingCenterMember
Amortization of principal							689,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointTwoEightMaturingFebruaryTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_GreatFallsShoppingCenterMember
Number of notes							3bfs_NumberOfNotes / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointTwoEightMaturingFebruaryTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_GreatFallsShoppingCenterMember
Fixed Rate Mortgage Notes Payable | 7.35% due June 2024
Notes Payable [Line Items]
Interest rate							7.35%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointThreeFiveMaturingJuneTwentyTwentyFourMember
Fixed Rate Mortgage Notes Payable | 7.35% due June 2024 | Leesburg Pike
Notes Payable [Line Items]
Principal and interest payments							135,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointThreeFiveMaturingJuneTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_LeesburgPikeMember
Amortization period							25 years
Debt instrument final payment							11,500,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointThreeFiveMaturingJuneTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_LeesburgPikeMember
Amortization of principal							373,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointThreeFiveMaturingJuneTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_LeesburgPikeMember
Fixed Rate Mortgage Notes Payable | 7.60% due June 2024
Notes Payable [Line Items]
Interest rate							7.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointSixZeroMaturingJuneTwentyTwentyFourMember
Fixed Rate Mortgage Notes Payable | 7.60% due June 2024 | Village Center
Notes Payable [Line Items]
Principal and interest payments							119,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointSixZeroMaturingJuneTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_VillageCenterMember
Amortization period							25 years
Debt instrument final payment							10,100,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointSixZeroMaturingJuneTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_VillageCenterMember
Amortization of principal							314,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointSixZeroMaturingJuneTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_VillageCenterMember
Fixed Rate Mortgage Notes Payable | 7.02% due July 2024
Notes Payable [Line Items]
Interest rate							7.02%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointZeroTwoMaturingJulyTwentyTwentyFourMember
Fixed Rate Mortgage Notes Payable | 7.02% due July 2024 | White Oak Shopping Center
Notes Payable [Line Items]
Principal and interest payments							193,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointZeroTwoMaturingJulyTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_WhiteOakShoppingCenterMember
Amortization period							24 years 4 months 24 days
Debt instrument final payment							18,500,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointZeroTwoMaturingJulyTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_WhiteOakShoppingCenterMember
Amortization of principal							514,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointZeroTwoMaturingJulyTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_WhiteOakShoppingCenterMember
Debt instrument amount											10,500,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointZeroTwoMaturingJulyTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_WhiteOakShoppingCenterMember
Fixed Rate Mortgage Notes Payable | 7.45% due July 2024
Notes Payable [Line Items]
Interest rate							7.45%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointFourFiveMaturingJulyTwentyTwentyFourMember
Fixed Rate Mortgage Notes Payable | 7.45% due July 2024 | Avenel Business Park
Notes Payable [Line Items]
Principal and interest payments							246,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointFourFiveMaturingJulyTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_AvenelBusinessParkMember
Amortization period							25 years
Debt instrument final payment							20,900,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointFourFiveMaturingJulyTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_AvenelBusinessParkMember
Amortization of principal							664,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointFourFiveMaturingJulyTwentyTwentyFourMember / bfs_RealEstatePropertyNameAxis = bfs_AvenelBusinessParkMember
Fixed Rate Mortgage Notes Payable | 7.30% due January 2025
Notes Payable [Line Items]
Interest rate							7.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointThreeZeroMaturingJulyTwentyTwentyFiveMember
Fixed Rate Mortgage Notes Payable | 7.30% due January 2025 | Ashburn Village
Notes Payable [Line Items]
Principal and interest payments							240,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointThreeZeroMaturingJulyTwentyTwentyFiveMember / bfs_RealEstatePropertyNameAxis = bfs_AshburnVillageMember
Amortization period							25 years
Debt instrument final payment							20,500,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointThreeZeroMaturingJulyTwentyTwentyFiveMember / bfs_RealEstatePropertyNameAxis = bfs_AshburnVillageMember
Amortization of principal							641,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SevenPointThreeZeroMaturingJulyTwentyTwentyFiveMember / bfs_RealEstatePropertyNameAxis = bfs_AshburnVillageMember
Fixed Rate Mortgage Notes Payable | 6.18% due January 2026
Notes Payable [Line Items]
Interest rate							6.18%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointOneEightMaturingJanuaryTwentyTwentySixMember
Fixed Rate Mortgage Notes Payable | 6.18% due January 2026 | Ravenwood
Notes Payable [Line Items]
Principal and interest payments							111,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointOneEightMaturingJanuaryTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_RavenwoodMember
Amortization period							25 years
Debt instrument final payment							10,100,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointOneEightMaturingJanuaryTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_RavenwoodMember
Amortization of principal							352,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_SixPointOneEightMaturingJanuaryTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_RavenwoodMember
Fixed Rate Mortgage Notes Payable | 5.31% due April 2026
Notes Payable [Line Items]
Interest rate							5.31%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointThreeOneMaturingAprilTwentyTwentySixMember
Fixed Rate Mortgage Notes Payable | 5.31% due April 2026 | Clarendon Center
Notes Payable [Line Items]
Principal and interest payments							753,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointThreeOneMaturingAprilTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_ClarendonCenterMember
Amortization period							25 years
Debt instrument final payment							70,500,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointThreeOneMaturingAprilTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_ClarendonCenterMember
Amortization of principal							2,800,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointThreeOneMaturingAprilTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_ClarendonCenterMember
Fixed Rate Mortgage Notes Payable | 4.30% due October 2026
Notes Payable [Line Items]
Interest rate							4.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointThreeZeroMaturingOctoberTwentyTwentySixMember
Fixed Rate Mortgage Notes Payable | 4.30% due October 2026 | Severna Park Market Place
Notes Payable [Line Items]
Principal and interest payments							207,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointThreeZeroMaturingOctoberTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_SevernaParkMarketplaceMember
Amortization period							25 years
Debt instrument final payment							20,300,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointThreeZeroMaturingOctoberTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_SevernaParkMarketplaceMember
Amortization of principal							950,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointThreeZeroMaturingOctoberTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_SevernaParkMarketplaceMember
Fixed Rate Mortgage Notes Payable | 4.53% due November 2026
Notes Payable [Line Items]
Interest rate							4.53%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointFiveThreeMaturingNovemberTwentyTwentySixMember
Fixed Rate Mortgage Notes Payable | 4.53% due November 2026 | Kentlands Square II
Notes Payable [Line Items]
Principal and interest payments							240,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointFiveThreeMaturingNovemberTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_KentlandsSquareIIMember
Amortization period							25 years
Debt instrument final payment							23,100,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointFiveThreeMaturingNovemberTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_KentlandsSquareIIMember
Amortization of principal							1,042,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointFiveThreeMaturingNovemberTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_KentlandsSquareIIMember
Fixed Rate Mortgage Notes Payable | 4.70% due December 2026
Notes Payable [Line Items]
Interest rate							4.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointSevenZeroMaturingDecemberTwentyTwentySixMember
Fixed Rate Mortgage Notes Payable | 4.70% due December 2026 | Cranberry Square
Notes Payable [Line Items]
Principal and interest payments							113,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointSevenZeroMaturingDecemberTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_CranberrySquareMember
Amortization period							25 years
Debt instrument final payment							10,900,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointSevenZeroMaturingDecemberTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_CranberrySquareMember
Amortization of principal							473,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointSevenZeroMaturingDecemberTwentyTwentySixMember / bfs_RealEstatePropertyNameAxis = bfs_CranberrySquareMember
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027
Notes Payable [Line Items]
Interest rate							5.84%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027 | Seven Corners
Notes Payable [Line Items]
Principal and interest payments			463,200us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember / bfs_RealEstatePropertyNameAxis = bfs_SevenCornersMember				463,200us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember / bfs_RealEstatePropertyNameAxis = bfs_SevenCornersMember
Amortization period							25 years
Debt instrument final payment			42,300,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember / bfs_RealEstatePropertyNameAxis = bfs_SevenCornersMember				42,300,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember / bfs_RealEstatePropertyNameAxis = bfs_SevenCornersMember
Amortization of principal							1,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember / bfs_RealEstatePropertyNameAxis = bfs_SevenCornersMember
Debt instrument amount							73,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember / bfs_RealEstatePropertyNameAxis = bfs_SevenCornersMember
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028
Notes Payable [Line Items]
Interest rate							4.04%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointZeroFourMaturingAprilTwentyTwentyEightMember
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028 | Hampshire Langley
Notes Payable [Line Items]
Principal and interest payments							95,400us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointZeroFourMaturingAprilTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_HampshireLangleyMember
Amortization period							25 years
Debt instrument final payment							9,500,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointZeroFourMaturingAprilTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_HampshireLangleyMember
Amortization of principal							437,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointZeroFourMaturingAprilTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_HampshireLangleyMember
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028
Notes Payable [Line Items]
Interest rate							3.51%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointFiveOneMaturingJuneTwentyTwentyEightMember
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028 | Beacon Center
Notes Payable [Line Items]
Principal and interest payments							203,200us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointFiveOneMaturingJuneTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_BeaconCenterMember
Amortization period							20 years
Debt instrument final payment							11,400,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointFiveOneMaturingJuneTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_BeaconCenterMember
Amortization of principal							1,251,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointFiveOneMaturingJuneTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_BeaconCenterMember
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028
Notes Payable [Line Items]
Interest rate							3.99%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointNineNineMaturingSeptemberTwentyTwentyEightMember
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028 | Seabreeze Plaza
Notes Payable [Line Items]
Principal and interest payments							94,900us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointNineNineMaturingSeptemberTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_SeabreezePlazaMember		94,900us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointNineNineMaturingSeptemberTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_SeabreezePlazaMember
Amortization period							25 years		25 years
Debt instrument final payment							9,500,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointNineNineMaturingSeptemberTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_SeabreezePlazaMember		9,500,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointNineNineMaturingSeptemberTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_SeabreezePlazaMember
Amortization of principal							433,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_ThreePointNineNineMaturingSeptemberTwentyTwentyEightMember / bfs_RealEstatePropertyNameAxis = bfs_SeabreezePlazaMember
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032
Notes Payable [Line Items]
Interest rate							4.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointEightEightMaturingSeptemberTwentyThirtyTwoMember
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032 | Park Van Ness
Notes Payable [Line Items]
Principal and interest payments							413,500us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointEightEightMaturingSeptemberTwentyThirtyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_ParkVanNessMember
Amortization period							25 years
Debt instrument final payment							39,600,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointEightEightMaturingSeptemberTwentyThirtyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_ParkVanNessMember
Debt instrument amount						71,580,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointEightEightMaturingSeptemberTwentyThirtyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_ParkVanNessMember	71,580,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_FourPointEightEightMaturingSeptemberTwentyThirtyTwoMember / bfs_RealEstatePropertyNameAxis = bfs_ParkVanNessMember
Fixed Rate Mortgage Notes Payable | 8.00% due April 2034
Notes Payable [Line Items]
Interest rate							8.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_EightPercentdueApril2034Member
Fixed Rate Mortgage Notes Payable | 8.00% due April 2034 | Olney
Notes Payable [Line Items]
Principal and interest payments							60,400us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_EightPercentdueApril2034Member / bfs_RealEstatePropertyNameAxis = bfs_OlneyMember
Debt instrument final payment							14,700,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_EightPercentdueApril2034Member / bfs_RealEstatePropertyNameAxis = bfs_OlneyMember
Amortization of principal							119,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_EightPercentdueApril2034Member / bfs_RealEstatePropertyNameAxis = bfs_OlneyMember
Fixed rate increase on note							1.50%bfs_FixedRateIncreaseonNote / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_EightPercentdueApril2034Member / bfs_RealEstatePropertyNameAxis = bfs_OlneyMember
Interest rate							8.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bfs_FixedRateMortgageNotesPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_EightPercentdueApril2034Member / bfs_RealEstatePropertyNameAxis = bfs_OlneyMember
Variable Rate Loans Payable
Notes Payable [Line Items]
Interest rate spread on LIBOR							1.53159%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember
Variable Rate Loans Payable | Revolving credit facility
Notes Payable [Line Items]
Line of credit facility, maximum borrowing capacity							275,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_UnsecuredRevolvingCreditFacilityMember
Interest rate spread on LIBOR							1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_UnsecuredRevolvingCreditFacilityMember
Debt maturity extension period							1 year
Debt instrument fee							0.15%bfs_DebtInstrumentFeePercentage / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_UnsecuredRevolvingCreditFacilityMember
Debt instrument frequency of periodic payment							Monthly
Variable Rate Loans Payable | Revolving credit facility | One-month LIBOR
Notes Payable [Line Items]
Interest rate spread on LIBOR							1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / bfs_DebtInstrumentInterestRateByTypeAxis = bfs_OneMonthLiborMember / us-gaap_LongtermDebtTypeAxis = bfs_UnsecuredRevolvingCreditFacilityMember
Variable Rate Loans Payable | Northrock loan
Notes Payable [Line Items]
Interest rate spread on LIBOR							1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_NorthrockLoanMember
Variable Rate Loans Payable | Northrock loan | Northrock
Notes Payable [Line Items]
Principal and interest payments							47,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_NorthrockLoanMember / bfs_RealEstatePropertyNameAxis = bfs_NorthrockMember
Debt instrument final payment							14,200,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_NorthrockLoanMember / bfs_RealEstatePropertyNameAxis = bfs_NorthrockMember
Amortization of principal							277,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_NorthrockLoanMember / bfs_RealEstatePropertyNameAxis = bfs_NorthrockMember
Variable Rate Loans Payable | Metro Pike Center bank loan
Notes Payable [Line Items]
Interest rate spread on LIBOR							1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_MetroPikeCenterBankLoanMember
Variable Rate Loans Payable | Metro Pike Center bank loan | Metro Pike Center
Notes Payable [Line Items]
Principal and interest payments							48,000us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_MetroPikeCenterBankLoanMember / bfs_RealEstatePropertyNameAxis = bfs_MetroPikeCenterMember
Debt instrument final payment							14,800,000bfs_DebtInstrumentFinalPaymentAmount / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_MetroPikeCenterBankLoanMember / bfs_RealEstatePropertyNameAxis = bfs_MetroPikeCenterMember
Amortization of principal							$ 288,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_DebtInstrumentAxis = bfs_VariableRateLoansPayableMember / us-gaap_LongtermDebtTypeAxis = bfs_MetroPikeCenterBankLoanMember / bfs_RealEstatePropertyNameAxis = bfs_MetroPikeCenterMember
[1] Interest rate and scheduled maturity data presented as of December 31, 2014. Totals computed using weighted averages.

X

- Definition

Debt Instrument Amortization Periods

+ References

No definition available.

+ Details

Name:	bfs_DebtInstrumentAmortizationPeriods
Namespace Prefix:	bfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Debt Instrument, Fee, Percentage

+ References

No definition available.

+ Details

Name:	bfs_DebtInstrumentFeePercentage
Namespace Prefix:	bfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Debt Instrument, Final Payment Amount

+ References

No definition available.

+ Details

Name:	bfs_DebtInstrumentFinalPaymentAmount
Namespace Prefix:	bfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Debt Instrument, Potential Term Extension Period

+ References

No definition available.

+ Details

Name:	bfs_DebtInstrumentPotentialTermExtensionPeriod
Namespace Prefix:	bfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fixed Rate Increase on Note - Annual increase on amount due under notes payable

+ References

No definition available.

+ Details

Name:	bfs_FixedRateIncreaseonNote
Namespace Prefix:	bfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	bfs_NotesPayableLineItems
Namespace Prefix:	bfs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of Notes

+ References

No definition available.

+ Details

Name:	bfs_NumberOfNotes
Namespace Prefix:	bfs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Shopping Centers

+ References

No definition available.

+ Details

Name:	bfs_NumberOfShoppingCenters
Namespace Prefix:	bfs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentFrequencyOfPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the 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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 3

-Subparagraph (SX 210.12-04.(a))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	bfs_RealEstatePropertyNameAxis=bfs_MetroPikeCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	bfs_RealEstatePropertyNameAxis=bfs_NorthrockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	bfs_RealEstatePropertyNameAxis=bfs_WhiteOakShoppingCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=bfs_FixedRateMortgageNotesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=bfs_VariableRateLoansPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bfs_FivePointEightFourMaturingMayTwentyTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bfs_FourPointEightEightMaturingSeptemberTwentyThirtyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bfs_FourPointZeroFourMaturingAprilTwentyTwentyEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bfs_ThreePointFiveOneMaturingJuneTwentyTwentyEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bfs_ThreePointNineNineMaturingSeptemberTwentyTwentyEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: