Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Aug. 16, 2021
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Document Transition Report	false
Entity File Number	001-39043
Entity Registrant Name	BROADWAY FINANCIAL CORPORATION
Entity Central Index Key	0001001171
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4547287
Entity Address, Address Line One	5055 Wilshire Boulevard, Suite 500
Entity Address, City or Town	Los Angeles
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90036
City Area Code	323
Local Phone Number	634-1700
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	BYFC
Security Exchange Name	NASDAQ
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 Voting Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		43,674,046
Class B Non-Voting Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,404,621
Class C Non-Voting Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		16,689,775