Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Mar. 08, 2018	Jun. 30, 2017
Entity Registrant Name	BROADWAY FINANCIAL CORP \DE\
Entity Central Index Key	0001001171
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 52,798,000
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Voting common stock
Entity Common Stock, Shares Outstanding		18,713,729
Non-voting common stock
Entity Common Stock, Shares Outstanding		8,756,396