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Cover Page - USD ($) shares in Millions, $ in Millions	12 Months Ended
Cover Page - USD ($) shares in Millions, $ in Millions	Dec. 31, 2019	Feb. 20, 2020	Jun. 30, 2019
Document Information [Line Items]
Document type	10-K
Document Annual Report	true
Document period end date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	1-12254
Entity registrant name	SAUL CENTERS INC.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	52-1833074
Entity Address, Address Line One	7501 Wisconsin Avenue
Entity Address, Address Line Two	Suite 1500E
Entity Address, City or Town	Bethesda
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	20814-6522
City Area Code	301
Local Phone Number	986-6200
Entity well-known seasoned issuer	Yes
Entity voluntary filers	No
Entity current reporting status	Yes
Entity Interactive Data Current	Yes
Entity filer category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity common stock, shares outstanding		23.2
Entity public float			$ 723.3
Documents Incorporated by Reference	Registrant incorporates by reference into Part III (Items 10, 11, 12, 13 and 14) of this Annual Report on Form 10-K portions of registrant’s definitive Proxy Statement for the 2020 Annual Meeting of Stockholders to be filed with the Securities Exchange Commission pursuant to Regulation 14A. The definitive Proxy Statement will be filed with the Commission not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.
Amendment flag	false
Document fiscal year focus	2019
Document fiscal period focus	FY
Entity central index key	0000907254
Current fiscal year end date	--12-31
Common Stock, $0.01 Par Value
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.01 Par Value
Security Exchange Name	NYSE
Trading symbol	BFS
6.125% Series D Preferred Stock, $0.01 Par Value
Document Information [Line Items]
Title of 12(b) Security	6.125% Series D Preferred Stock, $0.01 Par Value
Security Exchange Name	NYSE
Trading symbol	BFS/PRD
6.000% Series E Preferred Stock, $0.01 Par Value
Document Information [Line Items]
Title of 12(b) Security	6.000% Series E Preferred Stock, $0.01 Par Value
Security Exchange Name	NYSE
Trading symbol	BFS/PRE