Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 09, 2022
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	000-56071
Entity Registrant Name	Eureka Homestead Bancorp, Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	83-4051300
Entity Address, Address Line One	1922 Veterans Memorial Boulevard
Entity Address, City or Town	Metairie
Entity Address, State or Province	LA
Entity Address, Postal Zip Code	70005
City Area Code	504
Local Phone Number	834-0242
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,072,127
Entity Central Index Key	0001769725
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Amendment Flag	false