Gladstone Commercial Corporation Annual report [Section 13 and 15(d), not S-K Item 405]

Annual report [Section 13 and 15(d), not S-K Item 405]

Mortgage Notes Payable, Credit Facility, and Senior Unsecured Notes - Credit Facility (Narrative) (Details)

Mortgage Notes Payable, Credit Facility, and Senior Unsecured Notes - Credit Facility (Narrative) (Details)							1 Months Ended
	Oct. 10, 2025 USD ($)	Sep. 27, 2022 USD ($)	Aug. 18, 2022 USD ($)	Feb. 11, 2021 USD ($)	Jul. 02, 2019 USD ($)	Oct. 27, 2017 USD ($)	Oct. 31, 2015 USD ($)	Dec. 31, 2025 USD ($)	Oct. 09, 2025 USD ($)	Sep. 30, 2025 property	Sep. 18, 2025 USD ($)	Sep. 17, 2025 USD ($)	Dec. 31, 2024 USD ($)	Aug. 17, 2022 USD ($)	Jul. 01, 2019 USD ($)	Oct. 26, 2017 USD ($)	Aug. 07, 2013 USD ($)
Debt Instrument [Line Items]
Number of property portfolio acquisition \| property										9
Variable interest rate, increase (decrease)	0.10%
Borrowings under Revolver								$ 37,370,000					$ 1,900,000
Variable rate term loan facility A
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 125,000,000				$ 160,000,000.0	$ 75,000,000.0		125,000,000	$ 160,000,000						$ 75,000,000.0	$ 25,000,000.0
Stated interest variable rates (as a percent)		3.70%
Variable rate term loan facility A \| London Interbank Offered Rate
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)						2.75%
Variable rate term loan facility A \| London Interbank Offered Rate \| Minimum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)					2.50%
Variable rate term loan facility A \| London Interbank Offered Rate \| Maximum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)					2.75%
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	200,000,000	$ 125,000,000	$ 120,000,000		$ 100,000,000.0			200,000,000	155,000,000		$ 155,000,000	$ 125,000,000		$ 100,000,000	$ 85,000,000.0
Debt instrument, fee amount	$ 4,200,000										$ 500,000
Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)	1.40%
Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)	2.10%
Variable rate term loan facility B
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 143,300,000		60,000,000	$ 65,000,000				143,300,000	60,000,000
Debt instrument, fee amount				500,000
Line of credit facility, delayed funding component				$ 15,000,000
Variable rate term loan facility B \| Minimum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)				1.40%
Variable rate term loan facility B \| Maximum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)				2.25%
Variable rate term loan facility B \| London Interbank Offered Rate \| Minimum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)				1.50%
Floor on LIBOR				0.25%
Variable rate term loan facility B \| London Interbank Offered Rate \| Maximum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)				1.75%
Variable rate term loan facility C
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 131,700,000	150,000,000	$ 140,000,000					131,700,000	$ 150,000,000
Debt instrument, fee amount		$ 4,200,000
Variable rate term loan facility C \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Minimum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)		3.15%	1.25%
Variable rate term loan facility C \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Maximum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)		3.75%	1.95%
Term Loan Facility \| Minimum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)	1.35%
Term Loan Facility \| Maximum
Debt Instrument [Line Items]
Stated interest variable rates (as a percent)	2.05%
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 85,000,000.0										$ 60,000,000
Reduction at each of the leverage tiers					0.10%
Borrowings under Revolver								$ 437,400,000
Line of credit at an interest rate (as a percent)								5.42%
Letters of credit, outstanding								$ 2,100,000
Line of credit facility, maximum additional amount drawn								$ 62,800,000
Line of Credit \| Five Year Term Loan Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 25,000,000.0
Debt instrument term							5 years
Reduction at each of the leverage tiers							0.05%
Line of Credit \| Variable rate term loan facility A
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 85,000,000.0
Debt instrument term					5 years
Reduction at each of the leverage tiers						0.25%
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument term					4 years
Debt instrument, fee amount					$ 1,300,000
Letter of Credit
Debt Instrument [Line Items]
Line of credit at an interest rate (as a percent)								1.60%