Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Mar. 26, 2021	Jun. 30, 2020
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-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Address, State or Province	CA
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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
Entity Public Float			$ 54,555,000
Common Stock Voting [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		19,142,498
Common Stock Non-Voting [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		8,756,396