Parent Company Only Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Condensed Statements of Income
Interest expense	$ (4,348)	$ (3,877)
Other expense	(1,035)	(658)
Income tax benefit (expense)	(1,863)	2,225
Net income	1,869	3,480
Broadway Financial Corporation
Condensed Statements of Income
Interest income	28
Interest expense	(194)	(167)
Other expense	(730)	(1,033)
Loss before income tax and undistributed subsidiary income	(896)	(1,200)
Income tax benefit (expense)	(326)	2,344
Equity in undistributed subsidiary income	3,091	2,336
Net income	$ 1,869	$ 3,480