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Commitments and Contingencies (Narrative) (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Apartment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Other Commitments [Line Items]      
Number of apartments under the project | Apartment 37    
Limited partner capital contribution commitment $ 7,579,000    
Annual LIHTCs mount awarded for the project 861,000    
Total anticipated LIHTCs amount under the housing project $ 8,613,000    
Project investment amortization period 10 years 10 years  
Carrying value of investment in limited partnership   $ 190,000 $ 233,000
Other Assets [Member]      
Other Commitments [Line Items]      
Carrying value of investment in limited partnership   $ 7,249,000 $ 1,710,000