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Fair Value of Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accrued interest excluded from carrying value $ 167  
Allowance for mortgage loan losses 76 $ 72
Rabbi Trust | Other Assets | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash surrender value $ 7,670