No definition available.

Name:	us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586

Parent Company Only Condensed Financial Information, Condensed Statements of Cash Flows (FY) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities [Abstract]
Net (loss) income	$ (244)	$ (279)	$ (61)	$ (137)	$ (206)	$ 815
Adjustments to reconcile net (loss) income to net cash used in operating activities [Abstract]
Change in other assets			15	5	124	187
Change in accrued expenses and other liabilities			(125)	322	310	(120)
Net cash (used in) provided by operating activities			(39,763)	8,540	8,533	234
Cash flows from investing activities [Abstract]
Net cash provided by (used in) investing activities			35,566	(6,498)	(39,149)	(818)
Cash flows from financing activities [Abstract]
Net cash provided by (used in) financing activities			58,347	3,129	29,531	(4,984)
Net change in cash and cash equivalents			54,150	5,171	(1,085)	(5,568)
Cash and cash equivalents at beginning of the period			15,566	16,651	16,651	22,219
Cash and cash equivalents at end of the period	$ 69,716	$ 21,822	69,716	21,822	15,566	16,651
Broadway Financial Corporation [Member]
Cash flows from operating activities [Abstract]
Net (loss) income					(206)	815
Adjustments to reconcile net (loss) income to net cash used in operating activities [Abstract]
Equity in undistributed subsidiary income					(459)	(1,297)
Change in other assets					(287)	(210)
Change in accrued expenses and other liabilities					(9)	(112)
Net cash (used in) provided by operating activities					(961)	(804)
Cash flows from investing activities [Abstract]
Dividends from bank subsidiary					1,650	600
Net cash provided by (used in) investing activities					1,650	600
Cash flows from financing activities [Abstract]
Common stock repurchased for tax withholdings					(14)	(108)
Repayments of borrowings					(765)	0
Proceeds from repayment of ESOP loan					68	68
Net cash provided by (used in) financing activities					(711)	(40)
Net change in cash and cash equivalents					(22)	(244)
Cash and cash equivalents at beginning of the period			$ 134	$ 156	156	400
Cash and cash equivalents at end of the period					$ 134	$ 156