Parent Company Only Condensed Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income		$ 1,869	$ 3,480
Adjustments to reconcile net income to net cash used in operating activities:
Change in other assets		332	593
Change in accrued expenses and other liabilities		(1,690)	(1,170)
Net cash (used in) provided by operating activities		(10,226)	930
Cash flows from investing activities
Net cash provided by (used in) investing activities		30,152	(74,104)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs			1,125
Repurchase of common stock			(3,997)
Loan to ESOP	$ (1,200)		(1,176)
Net cash (used in) provided by financing activities		(16,137)	23,765
Net change in cash and cash equivalents		3,789	(49,409)
Cash and cash equivalents at beginning of the year		18,430	67,839
Cash and cash equivalents at end of the year	18,430	22,219	18,430
Broadway Financial Corporation
Cash flows from operating activities
Net income		1,869	3,480
Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed subsidiary income		(3,091)	(2,336)
Change in other assets		330	(2,345)
Change in accrued expenses and other liabilities		(183)	128
Net cash (used in) provided by operating activities		(1,075)	(1,073)
Cash flows from investing activities
Dividends from bank subsidiary		500	4,000
Net cash provided by (used in) investing activities		500	4,000
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs			1,125
Repurchase of common stock			(3,997)
Loan to ESOP			(1,176)
Proceeds from repayment of ESOP loan		80
Net cash (used in) provided by financing activities		80	(4,048)
Net change in cash and cash equivalents		(495)	(1,121)
Cash and cash equivalents at beginning of the year		895	2,016
Cash and cash equivalents at end of the year	$ 895	$ 400	$ 895