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Loans Receivable Held for Investment, Activity in Allowance for Loan Losses by Loan Type (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
Allowance for Loan and Lease Losses by Loan Type [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 3,215 | $ 2,771 | $ 3,182 | $ 2,929 | $ 2,929 | $ 4,069
Provision for (recapture of) loan losses | 0 | 47 | 29 | (301) | (7) | (1,254)
Recoveries | 0 | 0 | 4 | 190 | 260 | 114
Loans charged off | 0 | 0 | 0 | 0 | 0 | 0
Ending balance | 3,215 | 2,818 | 3,215 | 2,818 | 3,182 | 2,929
Real Estate [Member] | Single Family [Member] |  |  |  |  |  |
Allowance for Loan and Lease Losses by Loan Type [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 312 | 369 | 369 | 594
Provision for (recapture of) loan losses |  |  |  |  | (57) | (225)
Recoveries |  |  |  |  | 0 | 0
Loans charged off |  |  |  |  | 0 | 0
Ending balance |  |  |  |  | 312 | 369
Real Estate [Member] | Multi-Family [Member] |  |  |  |  |  |
Allowance for Loan and Lease Losses by Loan Type [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 2,319 | 1,880 | 1,880 | 2,300
Provision for (recapture of) loan losses |  |  |  |  | 439 | (420)
Recoveries |  |  |  |  | 0 | 0
Loans charged off |  |  |  |  | 0 | 0
Ending balance |  |  |  |  | 2,319 | 1,880
Real Estate [Member] | Commercial Real Estate [Member] |  |  |  |  |  |
Allowance for Loan and Lease Losses by Loan Type [Roll Forward] |  |  |  |  |  |
Beginning balance | 169 | 58 | 133 | 52 | 52 | 71
Provision for (recapture of) loan losses | 17 | 0 | 53 | 6 | 81 | (19)
Recoveries | 0 | 0 | 0 | 0 | 0 | 0
Loans charged off | 0 | 0 | 0 | 0 | 0 | 0
Ending balance | 186 | 58 | 186 | 58 | 133 | 52
Real Estate [Member] | Church [Member] |  |  |  |  |  |
Allowance for Loan and Lease Losses by Loan Type [Roll Forward] |  |  |  |  |  |
Beginning balance | 282 | 401 | 362 | 603 | 603 | 1,081
Provision for (recapture of) loan losses | (28) | (24) | (108) | (416) | (501) | (592)
Recoveries | 0 | 0 | 0 | 190 | 260 | 114
Loans charged off | 0 | 0 | 0 | 0 | 0 | 0
Ending balance | 254 | 377 | 254 | 377 | 362 | 603
Real Estate [Member] | Construction [Member] |  |  |  |  |  |
Allowance for Loan and Lease Losses by Loan Type [Roll Forward] |  |  |  |  |  |
Beginning balance | 22 | 44 | 48 | 19 | 19 | 17
Provision for (recapture of) loan losses | 0 | 6 | (26) | 31 | 29 | 2
Recoveries | 0 | 0 | 0 | 0 | 0 | 0
Loans charged off | 0 | 0 | 0 | 0 | 0 | 0
Ending balance | 22 | 50 | 22 | 50 | 48 | 19
Commercial - Other [Member] |  |  |  |  |  |
Allowance for Loan and Lease Losses by Loan Type [Roll Forward] |  |  |  |  |  |
Beginning balance | 6 | 5 | 7 | 6 | 6 | 6
Provision for (recapture of) loan losses | (1) | 0 | (2) | (1) | 1 | 0
Recoveries | 0 | 0 | 0 | 0 | 0 | 0
Loans charged off | 0 | 0 | 0 | 0 | 0 | 0
Ending balance | 5 | 5 | 5 | 5 | 7 | 6
Consumer [Member] |  |  |  |  |  |
Allowance for Loan and Lease Losses by Loan Type [Roll Forward] |  |  |  |  |  |
Beginning balance | 0 | 3 | 1 | 0 | 0 | 0
Provision for (recapture of) loan losses | 2 | (1) | 1 | 2 | 1 | 0
Recoveries | 0 | 0 | 0 | 0 | 0 | 0
Loans charged off | 0 | 0 | 0 | 0 | 0 | 0
Ending balance | $ 2 | $ 2 | $ 2 | $ 2 | $ 1 | $ 0

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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