Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments applied to principal.

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Maturity period on fixed rate advances made and reported by Federal Home Loan Bank (FHLBank), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank).

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The carrying amount, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of FHLB debt obligations, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Borrowings (Q3) (Details) - USD ($) $ in Thousands		9 Months Ended		12 Months Ended
Borrowings (Q3) (Details) - USD ($) $ in Thousands	Oct. 16, 2014	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 17, 2004
Borrowings [Abstract]
Advances from Federal Home Loan Banks		$ 115,500		$ 84,000	$ 70,000
Weighted average interest rate		1.85%		2.32%	2.51%
Weighted average contractual maturity		28 months		18 months	24 months
Junior subordinated debentures		$ 3,570		$ 4,335	$ 5,100
Payment of principal amount		$ 765	$ 510	$ 765	$ 0
Floating Rate Junior Subordinated Debentures [Member]
Borrowings [Abstract]
Junior subordinated debentures	$ 5,100
Effective interest rate percentage on debentures		2.79%		4.44%
Payment of principal amount	$ 900
Debt instrument, maturity date		Mar. 17, 2024		Mar. 17, 2024
Scheduled principal payment		$ 1,500		$ 765
Floating Rate Junior Subordinated Debentures [Member] \| 3-Month LIBOR [Member]
Borrowings [Abstract]
Basis spread		2.54%		2.54%
Private Placement [Member] \| Floating Rate Junior Subordinated Debentures [Member]
Borrowings [Abstract]
Junior subordinated debentures						$ 6,000
First Mortgage Loans [Member]
Borrowings [Abstract]
FHLB advances, collateral real estate loans		$ 204,600		$ 156,100