XML 62 R48.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Additional Information) (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) shopping_center note | Dec. 31, 2017 USD ($) | Sep. 01, 2017 USD ($) | Dec. 31, 2012 USD ($)
Notes Payable [Line Items] |  |  |  |
Interest rate | 4.40% | 3.90% |  |
Fixed rate mortgages | $ 880,271,000 | $ 897,888,000 |  |
Fixed rate mortgage notes payable |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.18% |  |  |
Fixed rate mortgages | $ 910,189,000 | 890,393,000 |  |
Fixed rate mortgage notes payable | 5.88% due January 2019 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.88% |  |  |
Fixed rate mortgages | $ 0 | 30,201,000 |  |
Fixed rate mortgage notes payable | 5.88% due January 2019 | Broadlands Village, The Glen and Kentlands Square I |  |  |  |
Notes Payable [Line Items] |  |  |  |
Number of shopping centers | shopping_center | 3 |  |  |
Principal and interest payments | $ 306,000 |  |  |
Balloon payment to be paid | $ 28,400,000 |  |  |
Amortization period | 25 years |  |  |
Number of notes | note | 2 |  |  |
Fixed rate mortgage notes payable | 5.76% due May 2019 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.76% |  |  |
Fixed rate mortgages | $ 9,159,000 | 9,783,000 |  |
Fixed rate mortgage notes payable | 5.76% due May 2019 | Olde Forte Village |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 98,000 |  |  |
Balloon payment to be paid | $ 9,000,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 624,100 |  |  |
Fixed rate mortgage notes payable | 5.62% due July 2019 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.62% |  |  |
Fixed rate mortgages | $ 12,676,000 | 13,529,000 |  |
Fixed rate mortgage notes payable | 5.62% due July 2019 | Countryside |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 133,000 |  |  |
Balloon payment to be paid | $ 12,300,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 853,100 |  |  |
Fixed rate mortgage notes payable | 5.79% due September 2019 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.79% |  |  |
Fixed rate mortgages | $ 12,714,000 | 13,543,000 |  |
Fixed rate mortgage notes payable | 5.79% due September 2019 | Briggs Chancy MarketPlace |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 133,000 |  |  |
Balloon payment to be paid | $ 12,200,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 829,100 |  |  |
Fixed rate mortgage notes payable | 5.22% due January 2020 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.22% |  |  |
Fixed rate mortgages | $ 11,295,000 | 12,029,000 |  |
Fixed rate mortgage notes payable | 5.22% due January 2020 | Shops at Monocacy |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 112,000 |  |  |
Balloon payment to be paid | $ 10,600,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 733,800 |  |  |
Fixed rate mortgage notes payable | 5.60% due May 2020 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.60% |  |  |
Fixed rate mortgages | $ 9,601,000 | 9,948,000 |  |
Fixed rate mortgage notes payable | 5.60% due May 2020 | Boca Valley Plaza |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 75,000 |  |  |
Balloon payment to be paid | $ 9,100,000 |  |  |
Amortization period | 30 years |  |  |
Amortization of principal | $ 347,300 |  |  |
Fixed rate mortgage notes payable | 5.30% due June 2020 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.30% |  |  |
Fixed rate mortgages | $ 7,766,000 | 8,244,000 |  |
Fixed rate mortgage notes payable | 5.30% due June 2020 | Palm Springs Center |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 75,000 |  |  |
Balloon payment to be paid | $ 7,100,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 477,900 |  |  |
Fixed rate mortgage notes payable | 5.83% due July 2020 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.83% |  |  |
Fixed rate mortgages | $ 36,711,000 | 37,998,000 |  |
Fixed rate mortgage notes payable | 5.83% due July 2020 | Thruway |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 289,000 |  |  |
Balloon payment to be paid | $ 34,800,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 1,300,000 |  |  |
Fixed rate mortgage notes payable | 5.81% due February 2021 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.81% |  |  |
Fixed rate mortgages | $ 6,943,000 | 7,325,000 |  |
Fixed rate mortgage notes payable | 5.81% due February 2021 | Jamestown Place |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 66,000 |  |  |
Balloon payment to be paid | $ 6,100,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 381,700 |  |  |
Fixed rate mortgage notes payable | 6.01% due August 2021 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 6.01% |  |  |
Fixed rate mortgages | $ 5,480,000 | 5,649,000 |  |
Fixed rate mortgage notes payable | 6.01% due August 2021 | Hunt Club Corners |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 42,000 |  |  |
Balloon payment to be paid | $ 5,000,000 |  |  |
Amortization period | 30 years |  |  |
Amortization of principal | $ 169,300 |  |  |
Fixed rate mortgage notes payable | 5.62% due June 2022 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.62% |  |  |
Fixed rate mortgages | $ 31,723,000 | 32,673,000 |  |
Fixed rate mortgage notes payable | 5.62% due June 2022 | Landsowne Town Center |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 230,000 |  |  |
Balloon payment to be paid | $ 28,200,000 |  |  |
Amortization period | 30 years |  |  |
Amortization of principal | $ 949,600 |  |  |
Fixed rate mortgage notes payable | 6.08% due September 2022 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 6.08% |  |  |
Fixed rate mortgages | $ 9,728,000 | 9,999,000 |  |
Fixed rate mortgage notes payable | 6.08% due September 2022 | Orchard Park |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 73,000 |  |  |
Balloon payment to be paid | $ 8,600,000 |  |  |
Amortization period | 30 years |  |  |
Amortization of principal | $ 270,300 |  |  |
Fixed rate mortgage notes payable | 6.43% due April 2023 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 6.43% |  |  |
Fixed rate mortgages | $ 10,609,000 | 10,877,000 |  |
Fixed rate mortgage notes payable | 6.43% due April 2023 | BJs Wholesale |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 80,000 |  |  |
Balloon payment to be paid | $ 9,300,000 |  |  |
Amortization period | 30 years |  |  |
Amortization of principal | $ 268,400 |  |  |
Fixed rate mortgage notes payable | 6.28% due February 2024 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 6.28% |  |  |
Fixed rate mortgages | $ 11,702,000 | 12,577,000 |  |
Fixed rate mortgage notes payable | 6.28% due February 2024 | Great Falls Shopping Center |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 138,000 |  |  |
Balloon payment to be paid | $ 6,300,000 |  |  |
Amortization period | 26 years |  |  |
Amortization of principal | $ 874,800 |  |  |
Number of notes | note | 3 |  |  |
Fixed rate mortgage notes payable | 7.35% due June 2024 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 7.35% |  |  |
Fixed rate mortgages | $ 14,952,000 | 15,452,000 |  |
Fixed rate mortgage notes payable | 7.35% due June 2024 | Leesburg Pike |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 135,000 |  |  |
Balloon payment to be paid | $ 11,500,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 499,800 |  |  |
Fixed rate mortgage notes payable | 7.60% due June 2024 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 7.60% |  |  |
Fixed rate mortgages | $ 13,013,000 | 13,438,000 |  |
Fixed rate mortgage notes payable | 7.60% due June 2024 | Village Center |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 119,000 |  |  |
Balloon payment to be paid | $ 10,100,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 424,700 |  |  |
Fixed rate mortgage notes payable | 7.02% due July 2024 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 7.02% |  |  |
Fixed rate mortgages | $ 23,198,000 | 23,873,000 |  |
Fixed rate mortgage notes payable | 7.02% due July 2024 | White Oak Shopping Center |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 193,000 |  |  |
Balloon payment to be paid | $ 18,500,000 |  |  |
Amortization period | 24 years 4 months 24 days |  |  |
Loan amount |  |  |  | $ 10,500,000
Amortization of principal | $ 675,200 |  |  |
Fixed rate mortgage notes payable | 7.45% due July 2024 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 7.45% |  |  |
Fixed rate mortgages | $ 27,222,000 | 28,115,000 |  |
Fixed rate mortgage notes payable | 7.45% due July 2024 | Avenel Business Park |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 246,000 |  |  |
Balloon payment to be paid | $ 20,900,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 893,200 |  |  |
Fixed rate mortgage notes payable | 7.30% due January 2025 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 7.30% |  |  |
Fixed rate mortgages | $ 27,168,000 | 28,025,000 |  |
Fixed rate mortgage notes payable | 7.30% due January 2025 | Ashburn Village |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 240,000 |  |  |
Balloon payment to be paid | $ 20,500,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 858,000 |  |  |
Fixed rate mortgage notes payable | 6.18% due January 2026 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 6.18% |  |  |
Fixed rate mortgages | $ 14,086,000 | 14,537,000 |  |
Fixed rate mortgage notes payable | 6.18% due January 2026 | Ravenwood |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 111,000 |  |  |
Balloon payment to be paid | $ 10,100,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 451,200 |  |  |
Fixed rate mortgage notes payable | 5.31% due April 2026 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.31% |  |  |
Fixed rate mortgages | $ 102,310,000 | 105,817,000 |  |
Fixed rate mortgage notes payable | 5.31% due April 2026 | Clarendon Center |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 753,000 |  |  |
Balloon payment to be paid | $ 70,500,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 3,500,000 |  |  |
Fixed rate mortgage notes payable | 4.30% due October 2026 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 4.30% |  |  |
Fixed rate mortgages | $ 30,888,000 | 32,016,000 |  |
Fixed rate mortgage notes payable | 4.30% due October 2026 | Severna Park Market Place |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 207,000 |  |  |
Balloon payment to be paid | $ 20,300,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 1,100,000 |  |  |
Fixed rate mortgage notes payable | 4.53% due November 2026 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 4.53% |  |  |
Fixed rate mortgages | $ 35,258,000 | 36,507,000 |  |
Fixed rate mortgage notes payable | 4.53% due November 2026 | Kentlands Square II |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 240,000 |  |  |
Balloon payment to be paid | $ 23,100,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 1,200,000 |  |  |
Fixed rate mortgage notes payable | 4.70% due December 2026 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 4.70% |  |  |
Fixed rate mortgages | $ 16,515,000 | 17,086,000 |  |
Fixed rate mortgage notes payable | 4.70% due December 2026 | Cranberry Square |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 113,000 |  |  |
Balloon payment to be paid | $ 10,900,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 570,500 |  |  |
Fixed rate mortgage notes payable | 5.84% due May 2027 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 5.84% |  |  |
Fixed rate mortgages | $ 62,630,000 | 64,472,000 |  |
Fixed rate mortgage notes payable | 5.84% due May 2027 | Seven Corners |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 463,200 |  |  |
Balloon payment to be paid | $ 42,300,000 |  |  |
Amortization period | 25 years |  |  |
Loan amount | $ 73,000,000 |  |  |
Amortization of principal | $ 1,800,000 |  |  |
Fixed rate mortgage notes payable | 4.04% due April 2028 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 4.04% |  |  |
Fixed rate mortgages | $ 15,345,000 | 15,859,000 |  |
Fixed rate mortgage notes payable | 4.04% due April 2028 | Hampshire Langley |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 95,400 |  |  |
Balloon payment to be paid | $ 9,500,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 513,700 |  |  |
Fixed rate mortgage notes payable | 3.51% due June 2028 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 3.51% |  |  |
Fixed rate mortgages | $ 38,120,000 | 39,968,000 |  |
Fixed rate mortgage notes payable | 3.51% due June 2028 | Beacon Center |  |  |  |
Notes Payable [Line Items] |  |  |  |
Balloon payment to be paid | $ 17,100,000 |  |  |
Amortization period | 20 years |  |  |
Amortization of principal | $ 1,800,000 |  |  |
Fixed rate mortgage notes payable | 3.99% due September 2028 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 3.99% |  |  |
Fixed rate mortgages | $ 15,547,000 | 16,055,000 |  |
Fixed rate mortgage notes payable | 3.99% due September 2028 | Seabreeze Plaza |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 94,900 |  |  |
Balloon payment to be paid | $ 9,500,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 507,600 |  |  |
Fixed rate mortgage notes payable | 3.69% Due March 2030 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 3.69% |  |  |
Fixed rate mortgages | $ 27,060,000 | 27,884,000 |  |
Fixed rate mortgage notes payable | 3.69% Due March 2030 | Shops at Fairfax and Boulevard |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 153,300 |  |  |
Balloon payment to be paid | $ 15,500,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 824,000 |  |  |
Fixed rate mortgage notes payable | 3.99% Due April 2030 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 3.99% |  |  |
Fixed rate mortgages | $ 14,526,000 | 14,950,000 |  |
Fixed rate mortgage notes payable | 3.99% Due April 2030 | Northrock |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 84,400 |  |  |
Balloon payment to be paid | $ 8,400,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 423,600 |  |  |
Fixed rate mortgage notes payable | 3.39% due January 2032 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 3.39% |  |  |
Fixed rate mortgages | $ 38,076,000 | 39,140,000 |  |
Fixed rate mortgage notes payable | 3.39% due January 2032 | Burtonsville Town Square |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 197,900 |  |  |
Balloon payment to be paid | $ 20,300,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 1,100,000 |  |  |
Fixed rate mortgage notes payable | 4.88% due September 2032 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 4.88% |  |  |
Fixed rate mortgages | $ 69,691,000 | 71,211,000 |  |
Fixed rate mortgage notes payable | 4.88% due September 2032 | Park Van Ness |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 413,500 |  |  |
Balloon payment to be paid | $ 39,600,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 1,500,000 |  |  |
Fixed rate mortgages |  |  | $ 71,580,000 |
Fixed rate mortgage notes payable | 3.75% due December 2032 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 3.75% |  |  |
Fixed rate mortgages | $ 58,523,000 | 60,000,000 |  |
Fixed rate mortgage notes payable | 3.75% due December 2032 | Washington Square |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 308,500 |  |  |
Balloon payment to be paid | $ 31,100,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 1,500,000 |  |  |
Fixed rate mortgage notes payable | 4.41% mortgage maturing 2033 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 4.41% |  |  |
Fixed rate mortgages | $ 31,941,000 | 0 |  |
Fixed rate mortgage notes payable | 4.41% mortgage maturing 2033 | Broadlands Village |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 176,200 |  |  |
Balloon payment to be paid | $ 17,300,000 |  |  |
Amortization period | 25 years |  |  |
Amortization of principal | $ 58,600 |  |  |
Fixed rate mortgage notes payable | 4.69% fixed rate loan maturing in 2034 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 4.69% |  |  |
Fixed rate mortgages | $ 22,900,000 | 0 |  |
Fixed rate mortgage notes payable | 4.69% fixed rate loan maturing in 2034 | The Glen |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 129,800 |  |  |
Balloon payment to be paid | $ 12,500,000 |  |  |
Amortization period | 25 years |  |  |
Fixed rate mortgage notes payable | 8.00% due April 2034 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 8.00% |  |  |
Fixed rate mortgages | $ 11,781,000 | 11,613,000 |  |
Fixed rate mortgage notes payable | 8.00% due April 2034 | Olney |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | 60,400 |  |  |
Balloon payment to be paid | $ 14,700,000 |  |  |
Fixed rate increase on note | 1.50% |  |  |
Interest rate | 8.00% |  |  |
Negative amortization | $ (168,600) |  |  |
Fixed rate mortgage notes payable | 4.67% Construction To Permanent Loan Due 2035 |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate | 4.67% |  |  |
Fixed rate mortgages | $ 23,332,000 | $ 0 |  |
Fixed rate mortgage notes payable | 4.67% Construction To Permanent Loan Due 2035 | Glebe Road |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | $ 887,900 |  |  |
Amortization period | 25 years |  |  |
Fixed rate mortgages |  |  | $ 157,000,000 |
Variable rate loans payable |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate spread on LIBOR | 3.84% |  |  |
Variable rate loans payable | Metro Pike Center Bank Loan |  |  |  |
Notes Payable [Line Items] |  |  |  |
Interest rate spread on LIBOR | 1.65% |  |  |
Variable rate loans payable | Metro Pike Center Bank Loan | Metro Pike Center |  |  |  |
Notes Payable [Line Items] |  |  |  |
Principal and interest payments | $ 48,000 |  |  |
Balloon payment to be paid | 14,200,000 |  |  |
New Facility | Line of Credit |  |  |  |
Notes Payable [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 400,000,000 |  |  |
Revolving Credit Facility | New Facility | Line of Credit |  |  |  |
Notes Payable [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 325,000,000 |  |  |
Debt maturity extension period | 1 year |  |  |
Debt instrument fee | 0.15% |  |  |
Interest rate spread on LIBOR | 1.35% |  |  |
Term Facility | New Facility | Line of Credit |  |  |  |
Notes Payable [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 75,000,000 |  |  |
Interest rate spread on LIBOR | 1.30% |  |  |

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, 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
- Definition Notes Payable [Line Items] + References No definition available. + 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 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_AmortizationOfDebtDiscountPremium
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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
- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_SecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointEightEightMaturingJanuaryTwentyNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_BroadlandsVillageTheGlenandKentlandsSquareIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointSevenSixMaturingMayTwentyNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_OldeForteVillageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointSixTwoMaturingJulyTwentyNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_CountrysideMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointSevenNineMaturingSeptemberTwentyNineteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_BriggsChancyMarketPlaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointTwoTwoMaturingJanuaryTwentyTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_ShopsatMonocacyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointSixZeroMaturingMayTwentyTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_BocaValleyPlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointThreeZeroMaturingJuneTwentyTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_PalmSpringsCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointEightThreeMaturingJulyTwentyTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_ThruwayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointEightOneMaturingFebruaryTwentyTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_JamestownPlaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_SixPointZeroOneMaturingAugustTwentyTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_HuntClubCornersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointSixTwoMaturingJuneTwentyTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_LandsowneTownCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_SixPointZeroEightMaturingSeptemberTwentyTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_OrchardParkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_SixPointFourThreeMaturingAprilTwentyTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_BJsWholesaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_SixPointTwoEightMaturingFebruaryTwentyTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_GreatFallsShoppingCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_SevenPointThreeFiveMaturingJuneTwentyTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_LeesburgPikeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_SevenPointSixZeroMaturingJuneTwentyTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_VillageCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_SevenPointZeroTwoMaturingJulyTwentyTwentyFourMember
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_LongtermDebtTypeAxis=bfs_SevenPointFourFiveMaturingJulyTwentyTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_AvenelBusinessParkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_SevenPointThreeZeroMaturingJulyTwentyTwentyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_AshburnVillageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_SixPointOneEightMaturingJanuaryTwentyTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_RavenwoodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FivePointThreeOneMaturingAprilTwentyTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_ClarendonCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FourPointThreeZeroMaturingOctoberTwentyTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_SevernaParkMarketplaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FourPointFiveThreeMaturingNovemberTwentyTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_KentlandsSquareIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FourPointSevenZeroMaturingDecemberTwentyTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_CranberrySquareMember
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: | bfs_RealEstatePropertyNameAxis=bfs_SevenCornersMember
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: | bfs_RealEstatePropertyNameAxis=bfs_HampshireLangleyMember
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: | bfs_RealEstatePropertyNameAxis=bfs_BeaconCenterMember
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: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_SeabreezePlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_ThreePointSixNinePercentDueMarchTwentyThirtyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_ShopsatFairfaxandBoulevardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_ThreePointNinetyNineDueAprilTwentyThirtyMember
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: | us-gaap_LongtermDebtTypeAxis=bfs_ThreePointThreeNineMaturingFebruaryTwentyThirtyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_BurtonsvilleTownSquareMember
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: | bfs_RealEstatePropertyNameAxis=bfs_ParkVanNessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_ThreePointSevenFiveMaturingDecemberTwentyThirtyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_WashingtonSquareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FourPointFourOneMaturingOctoberTwentyThirtyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_BroadlandsVillageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FourPointSixNinePercentFixedRateLoanMaturingInTwentyThirtyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_TheGlenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_EightPercentdueApril2034Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_OlneyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=bfs_FourPointSixSevenPercentConstructionToPermanentLoanDueTwentyThirtyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_GlebeRoadMember
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_MetroPikeCenterBankLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bfs_RealEstatePropertyNameAxis=bfs_MetroPikeCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=bfs_NewFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=bfs_TermFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |