    <SEC-DOCUMENT>0000907254-21-000049-index.html : 20210510
    <SEC-HEADER>0000907254-21-000049.hdr.sgml : 20210510
    <ACCEPTANCE-DATETIME>20210510170159
    ACCESSION NUMBER:		0000907254-21-000049
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		42
    CONFORMED PERIOD OF REPORT:	20210507
    ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
    ITEM INFORMATION:		Submission of Matters to a Vote of Security Holders
    ITEM INFORMATION:		Other Events
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20210510
    DATE AS OF CHANGE:		20210510

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			SAUL CENTERS, INC.
    		CENTRAL INDEX KEY:			0000907254
    		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
    		IRS NUMBER:				521833074
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-12254
    		FILM NUMBER:		21908193

    	BUSINESS ADDRESS:
    		STREET 1:		7501 WISCONSIN AVENUE
    		STREET 2:		SUITE 1500
    		CITY:			BETHESDA
    		STATE:			MD
    		ZIP:			20814
    		BUSINESS PHONE:		3019866016

    	MAIL ADDRESS:
    		STREET 1:		7501 WISCONSIN AVENUE
    		STREET 2:		SUITE 1500
    		CITY:			BETHESDA
    		STATE:			MD
    		ZIP:			20814

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	SAUL CENTERS INC
    		DATE OF NAME CHANGE:	19930617
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>bfs-20210507.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: bfs-20210507.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.A
    <SEQUENCE>2
    <FILENAME>a2021annualshareholdersm.htm
    <DESCRIPTION>EX-99.A
    <TEXT>
    Document 2 - file: a2021annualshareholdersm.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>bfs-20210507.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 3 - file: bfs-20210507.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.CAL
    <SEQUENCE>4
    <FILENAME>bfs-20210507_cal.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
    <TEXT>
    Document 4 - file: bfs-20210507_cal.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>5
    <FILENAME>bfs-20210507_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: bfs-20210507_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>6
    <FILENAME>bfs-20210507_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: bfs-20210507_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>7
    <FILENAME>bfs-20210507_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 7 - file: bfs-20210507_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>a2021annualshareholdersm001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: a2021annualshareholdersm001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>a2021annualshareholdersm002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: a2021annualshareholdersm002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>a2021annualshareholdersm003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: a2021annualshareholdersm003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>a2021annualshareholdersm004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: a2021annualshareholdersm004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>a2021annualshareholdersm005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: a2021annualshareholdersm005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>a2021annualshareholdersm006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: a2021annualshareholdersm006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>a2021annualshareholdersm007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: a2021annualshareholdersm007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>a2021annualshareholdersm008.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: a2021annualshareholdersm008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>a2021annualshareholdersm009.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: a2021annualshareholdersm009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>a2021annualshareholdersm010.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: a2021annualshareholdersm010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>a2021annualshareholdersm011.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: a2021annualshareholdersm011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>a2021annualshareholdersm012.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: a2021annualshareholdersm012.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>a2021annualshareholdersm013.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: a2021annualshareholdersm013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>a2021annualshareholdersm014.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: a2021annualshareholdersm014.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>a2021annualshareholdersm015.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: a2021annualshareholdersm015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>a2021annualshareholdersm016.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 23 - file: a2021annualshareholdersm016.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>a2021annualshareholdersm017.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: a2021annualshareholdersm017.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>a2021annualshareholdersm018.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 25 - file: a2021annualshareholdersm018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>a2021annualshareholdersm019.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 26 - file: a2021annualshareholdersm019.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>a2021annualshareholdersm020.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 27 - file: a2021annualshareholdersm020.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>a2021annualshareholdersm021.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 28 - file: a2021annualshareholdersm021.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>a2021annualshareholdersm022.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 29 - file: a2021annualshareholdersm022.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>a2021annualshareholdersm023.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 30 - file: a2021annualshareholdersm023.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>a2021annualshareholdersm024.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 31 - file: a2021annualshareholdersm024.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>a2021annualshareholdersm025.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 32 - file: a2021annualshareholdersm025.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>a2021annualshareholdersm026.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 33 - file: a2021annualshareholdersm026.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>a2021annualshareholdersm027.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 34 - file: a2021annualshareholdersm027.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>35
    <FILENAME>bfs-20210507_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 35 - file: bfs-20210507_htm.html

    Document 35 - RAW XML: bfs-20210507_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>36
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 36 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>37
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 37 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>38
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 38 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>39
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 39 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>40
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 40 - file: FilingSummary.html

    Document 40 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>42
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 42 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>43
    <FILENAME>0000907254-21-000049-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 43 - file: 0000907254-21-000049-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>