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Loans Receivable Held for Investment, Allowance for Loan Losses and Recorded Investment in Loans by Type of Loans and Based on Impairment Method (Q3) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | ---
Ending Allowance Balance Attributable to Loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment | $ 148 |  | $ 147 |  |  | $ 227 |
Collectively evaluated for impairment | 3,067 |  | 3,035 |  |  | 2,702 |
Total ending allowance balance | 3,215 | $ 3,215 | 3,182 | $ 2,818 | $ 2,771 | 2,929 | $ 4,069
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment | 4,799 |  | 5,343 |  |  | 6,380 |
Loans collectively evaluated for impairment | 360,209 |  | 395,686 |  |  | 352,105 |
Gross loans receivable | 365,008 |  | 401,029 |  |  | 358,485 |
Real Estate [Member] | Single Family [Member] |  |  |  |  |  |  |
Ending Allowance Balance Attributable to Loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment | 91 |  | 60 |  |  |  |
Collectively evaluated for impairment | 230 |  | 252 |  |  |  |
Total ending allowance balance | 321 | 312 | 312 | 328 | 328 | 369 |
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment | 586 |  | 611 |  |  |  |
Loans collectively evaluated for impairment | 53,548 |  | 72,501 |  |  |  |
Gross loans receivable | 54,134 |  | 73,112 |  |  |  |
Real Estate [Member] | Multi-Family [Member] |  |  |  |  |  |  |
Ending Allowance Balance Attributable to Loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |  |
Collectively evaluated for impairment | 2,425 |  | 2,319 |  |  |  |
Total ending allowance balance | 2,425 | 2,424 | 2,319 | 1,998 | 1,932 | 1,880 |
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment | 304 |  | 313 |  |  |  |
Loans collectively evaluated for impairment | 271,071 |  | 288,730 |  |  |  |
Gross loans receivable | 271,375 |  | 289,043 |  |  |  |
Real Estate [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Ending Allowance Balance Attributable to Loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  | 0 |
Collectively evaluated for impairment | 186 |  | 133 |  |  | 52 |
Total ending allowance balance | 186 | 169 | 133 | 58 | 58 | 52 | 71
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment | 0 |  | 0 |  |  | 0 |
Loans collectively evaluated for impairment | 20,086 |  | 14,818 |  |  | 5,800 |
Gross loans receivable | 20,086 |  | 14,818 |  |  | 5,800 |
Real Estate [Member] | Church [Member] |  |  |  |  |  |  |
Ending Allowance Balance Attributable to Loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment | 56 |  | 85 |  |  | 170 |
Collectively evaluated for impairment | 198 |  | 277 |  |  | 433 |
Total ending allowance balance | 254 | 282 | 362 | 377 | 401 | 603 | 1,081
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment | 3,860 |  | 4,356 |  |  | 5,383 |
Loans collectively evaluated for impairment | 13,571 |  | 16,292 |  |  | 19,713 |
Gross loans receivable | 17,431 |  | 20,648 |  |  | 25,096 |
Real Estate [Member] | Construction [Member] |  |  |  |  |  |  |
Ending Allowance Balance Attributable to Loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  | 0 |
Collectively evaluated for impairment | 22 |  | 48 |  |  | 19 |
Total ending allowance balance | 22 | 22 | 48 | 50 | 44 | 19 | 17
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment | 0 |  | 0 |  |  | 0 |
Loans collectively evaluated for impairment | 1,672 |  | 3,125 |  |  | 1,872 |
Gross loans receivable | 1,672 |  | 3,125 |  |  | 1,872 |
Commercial - Other [Member] |  |  |  |  |  |  |
Ending Allowance Balance Attributable to Loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment | 1 |  | 2 |  |  | 4 |
Collectively evaluated for impairment | 4 |  | 5 |  |  | 2 |
Total ending allowance balance | 5 | 6 | 7 | 5 | 5 | 6 | 6
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment | 49 |  | 63 |  |  | 64 |
Loans collectively evaluated for impairment | 253 |  | 199 |  |  | 162 |
Gross loans receivable | 302 |  | 262 |  |  | 226 |
Consumer [Member] |  |  |  |  |  |  |
Ending Allowance Balance Attributable to Loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  | 0 |
Collectively evaluated for impairment | 2 |  | 1 |  |  | 0 |
Total ending allowance balance | 2 | $ 0 | 1 | $ 2 | $ 3 | 0 | $ 0
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment | 0 |  | 0 |  |  | 0 |
Loans collectively evaluated for impairment | 8 |  | 21 |  |  | 5 |
Gross loans receivable | $ 8 |  | $ 21 |  |  | $ 5 |

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