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Fair Value, Fair Values of Financial Instruments (FY) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financial Assets [Abstract] |  |  |  |
Securities available-for-sale | $ 10,372 | $ 11,006 |  | $ 14,722
Carrying Value [Member] |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and cash equivalents |  | 15,566 |  | 16,651
Securities available-for-sale |  | 11,006 |  | 14,722
Loans receivable held for sale | 40,653 | 0 |  | 6,231
Loans receivable held for investment | 361,793 | 397,847 | [1] | 355,556
Accrued interest receivable |  | 1,223 |  | 1,143
Financial Liabilities [Abstract] |  |  |  |
Deposits |  | 297,724 |  | 281,414
Federal Home Loan Bank advances | 115,500 | 84,000 |  | 70,000
Junior subordinated debentures | 3,570 | 4,335 |  | 5,100
Accrued interest payable |  | 384 |  | 334
Fair Value [Member] |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and cash equivalents |  | 15,566 |  | 16,651
Securities available-for-sale |  | 11,006 |  | 14,722
Loans receivable held for sale | 40,667 | 0 |  | 6,270
Loans receivable held for investment | 366,160 | 404,923 | [1] | 354,792
Accrued interest receivable |  | 1,223 |  | 1,143
Financial Liabilities [Abstract] |  |  |  |
Deposits |  | 289,629 |  | 269,418
Federal Home Loan Bank advances | 119,334 | 84,997 |  | 69,933
Junior subordinated debentures | 3,029 | 3,734 |  | 4,481
Accrued interest payable |  | 384 |  | 334
Fair Value [Member] | Level 1 [Member] |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and cash equivalents |  | 15,566 |  | 16,651
Securities available-for-sale |  | 0 |  | 1,979
Loans receivable held for sale | 0 | 0 |  | 0
Loans receivable held for investment | 0 | 0 | [1] | 0
Accrued interest receivable |  | 69 |  | 78
Financial Liabilities [Abstract] |  |  |  |
Deposits |  | 0 |  | 0
Federal Home Loan Bank advances | 0 | 0 |  | 0
Junior subordinated debentures | 0 | 0 |  | 0
Accrued interest payable |  | 0 |  | 0
Fair Value [Member] | Level 2 [Member] |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and cash equivalents |  | 0 |  | 0
Securities available-for-sale |  | 11,006 |  | 12,743
Loans receivable held for sale | 40,667 | 0 |  | 6,270
Loans receivable held for investment | 0 | 0 | [1] | 0
Accrued interest receivable |  | 22 |  | 43
Financial Liabilities [Abstract] |  |  |  |
Deposits |  | 289,629 |  | 269,418
Federal Home Loan Bank advances | 119,334 | 84,997 |  | 69,933
Junior subordinated debentures | 0 | 0 |  | 0
Accrued interest payable |  | 377 |  | 324
Fair Value [Member] | Level 3 [Member] |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and cash equivalents |  | 0 |  | 0
Securities available-for-sale |  | 0 |  | 0
Loans receivable held for sale | 0 | 0 |  | 0
Loans receivable held for investment | 366,160 | 404,923 | [1] | 354,792
Accrued interest receivable |  | 1,132 |  | 1,022
Financial Liabilities [Abstract] |  |  |  |
Deposits |  | 0 |  | 0
Federal Home Loan Bank advances | 0 | 0 |  | 0
Junior subordinated debentures | $ 3,029 | 3,734 |  | 4,481
Accrued interest payable |  | $ 7 |  | $ 10
[1] | The estimated value of loans held for investment at December 31, 2019 and 2018 reflect an exit price assumption.

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