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Employee Benefit Plans (FY) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Broadway Federal 401(k) Plan [Abstract] |  |  |  |  |  |  |
Employer matching contribution, percent of match |  |  |  |  |  | 50.00% |
Employer matching contribution, percent of compensation contributed |  |  |  |  |  | 6.00% |
401(k) benefit plan expense |  |  |  |  |  | $ 135 | $ 131
ESOP Plan [Abstract] |  |  |  |  |  |  |
Number of common stock purchased by ESOP (in shares) | 1,493,679 |  |  |  |  |  |
Purchase price of common stock (in dollars per share) | $ 1.59 |  |  |  |  |  |
Total cost of shares purchased by ESOP | $ 2,400 |  |  |  |  |  |
Loan to ESOP | $ 1,200 |  |  |  |  |  |
Term of ESOP loan | 20 years |  |  |  |  | 20 years |
Compensation expense related to ESOP |  | $ 18 | $ 18 | $ 50 | $ 47 | $ 65 | $ 80
Shares Held by ESOP [Abstract] |  |  |  |  |  |  |
Allocated to participants (in shares) |  | 1,065,275 |  | 1,065,275 |  | 1,024,429 | 1,036,809
Committed to be released (in shares) |  | 0 |  | 0 |  | 10,416 | 10,580
Suspense shares (in shares) |  | 572,627 |  | 572,627 |  | 603,876 | 646,033
Total ESOP shares (in shares) |  | 1,637,902 |  | 1,637,902 |  | 1,638,721 | 1,693,422
Fair value of unearned shares |  | $ 962 |  | $ 962 |  | $ 930 | $ 678
Shares released for allocation (in shares) |  |  |  |  |  | 42,321 | 42,009
Unearned ESOP shares |  | $ 909 |  | $ 909 |  | $ 959 | $ 1,027
Maximum [Member] |  |  |  |  |  |  |
Broadway Federal 401(k) Plan [Abstract] |  |  |  |  |  |  |
Employee contributions as a percentage of their compensation |  |  |  |  |  | 15.00% |

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- Definition Cost of shares purchased by the Employee Stock Option Plan ("ESOP") during the period. + References No definition available. + Details
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- References No definition available. + Details
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- References No definition available. + Details
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- Definition The number of shares released for allocation to participants under employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition Represents the term of the ESOP loan. + References No definition available. + Details
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- Definition Cost of unearned shares that qualify as permanent equity that are held by an employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Fair value of unearned shares held by the employee stock ownership plan (ESOP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition The shares that, although not legally released, will be released by a future scheduled and committed debt service payment and will be allocated to employees for service rendered in the current accounting period. The ESOP documents typically define the period of service to which the shares relate. ESOP shares are released to compensate employees directly, to settle employer liabilities for other employee benefits, and to replace dividends on allocated shares that are used for debt service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Shares contributed to the ESOP that have not yet been released, committed to be released, or allocated to participant accounts. Suspense shares generally collateralize ESOP debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Weighted average purchase price of capital shares purchased through an employee stock ownership plan. + References No definition available. + Details
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- Definition The cash outflow to finance the entity's defined contribution plan to acquire shares of the entity. The plan initially holds the shares in a suspense account, which is collateral for the loan. As the plan makes payment on the debt, the shares are released from the suspense account and become available to be allocated to participant accounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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