Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 11, 2021
Document Information [Line Items]
Entity Registrant Name	BROADWAY FINANCIAL CORP \DE\
Entity Central Index Key	0001001171
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Address, State or Province	CA
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		43,630,884
Class B Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,404,621
Class C Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		16,689,775