Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 13, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	Eureka Homestead Bancorp, Inc.
Entity Central Index Key	0001769725
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	No
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		1,429,676
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3