Fair Value Measurements (Schedule of Valuation Methodologies Used to Measure the Fair Value Adjustments for Level 3 Assets Recorded at Fair Value on a Nonrecurring Basis) (Details) $ in Thousands	Sep. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($) item	Dec. 31, 2015 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis, Valuation Techniques [Line Items]
Investment in joint venture | $	$ 889	$ 891	$ 900
Foreclosed assets | $	301	301
Significant Unobservable Inputs Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis, Valuation Techniques [Line Items]
Impaired Loans | $	5,815	8,640
Investment in joint venture | $	889	891
Foreclosed assets | $	$ 301	$ 301
Significant Unobservable Inputs Level 3 [Member] | Joint Venture [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis, Valuation Techniques [Line Items]
Investment in joint venture, measurement input	0	0
Significant Unobservable Inputs Level 3 [Member] | Foreclosed Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis, Valuation Techniques [Line Items]
Foreclosed assets. measurement input	0.06	0.06
Minimum [Member] | Significant Unobservable Inputs Level 3 [Member] | Impaired Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis, Valuation Techniques [Line Items]
Impaired Loans Unobservable Input	0.21	0.21
Maximum [Member] | Significant Unobservable Inputs Level 3 [Member] | Impaired Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis, Valuation Techniques [Line Items]
Impaired Loans Unobservable Input	0.81	0.81
Weighted Average [Member] | Significant Unobservable Inputs Level 3 [Member] | Impaired Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis, Valuation Techniques [Line Items]
Impaired Loans Unobservable Input	0.23	0.23
Weighted Average [Member] | Significant Unobservable Inputs Level 3 [Member] | Joint Venture [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis, Valuation Techniques [Line Items]
Investment in joint venture, measurement input	0	0
Weighted Average [Member] | Significant Unobservable Inputs Level 3 [Member] | Foreclosed Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis, Valuation Techniques [Line Items]
Foreclosed assets. measurement input	0.06	0.06