Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 25, 2020	Jun. 30, 2019
Document And Entity Information
Entity Registrant Name	Postal Realty Trust, Inc.
Entity Central Index Key	0001759774
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Current Reporting Status	Yes
Entity File Number	001-38903
Entity Interactive Data Current	Yes
Entity Incorporation State Country Code	MD
Entity Common Stock, Shares Outstanding		5,392,906
Entity Public Float			$ 70,900,000
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019