Gladstone Commercial Corporation Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Acquired Properties (Details) $ in Thousands					3 Months Ended
	Jan. 22, 2021 USD ($) ft² tenant	Mar. 09, 2020 USD ($) ft² tenant	Jan. 27, 2020 USD ($) ft² property	Jan. 08, 2020 USD ($) ft² tenant	Mar. 31, 2021 USD ($) ft² property	Mar. 31, 2020 USD ($) ft² property
Business Acquisition [Line Items]
Number of properties acquired \| property					1	5
Purchase Price					$ 11,146	$ 71,965
Findlay, Ohio
Business Acquisition [Line Items]
Square Footage \| ft²	180,152
Lease Term	14 years 2 months 12 days
Purchase Price	$ 11,100
Number of tenants \| tenant	1
Indianapolis, Indiana
Business Acquisition [Line Items]
Square Footage \| ft²				64,800
Lease Term				7 years 2 months 12 days
Purchase Price				$ 5,300
Number of tenants \| tenant				3
Houston, Texas; Charlotte, North Carolina; St. Charles, Missouri
Business Acquisition [Line Items]
Square Footage \| ft²			320,838
Lease Term			20 years
Purchase Price			$ 34,700
Number of properties in portfolio \| property			3
Crandall, Georgia
Business Acquisition [Line Items]
Square Footage \| ft²		504,400
Lease Term		10 years 6 months
Purchase Price		$ 32,000
Number of tenants \| tenant		1
Series of property acquisitions
Business Acquisition [Line Items]
Square Footage \| ft²					180,152	890,038
Lease Term					14 years 2 months 12 days	14 years 9 months 18 days
Purchase Price					$ 11,146	$ 71,965
Aggregate Capitalized Acquisition Costs					$ 146	$ 255