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FHLB Advances And Other Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2018
PPPLF fixed rate       0.35%    
Weighted average life       1 year 6 months    
Third-Party Bank [Member]            
Line of credit, borrowing capacity           $ 10,000,000
Variable rate spread 0.75%          
Third-Party Bank [Member] | Term Loan [Member]            
Loan $ 5,000,000   $ 5,000,000 $ 4,625,000    
Line Of Credit [Member] | Third-Party Bank [Member]            
Line of credit, borrowing capacity 10,000,000   10,000,000      
Line of credit outstanding 0   0 5,000,000    
Outstanding borrowings 5,000,000   5,000,000      
Line Of Credit [Member] | Third-Party Bank [Member] | Term Loan [Member]            
Principal payments $ 125,000          
Line of credit, expiration date Dec. 23, 2022          
Line Of Credit [Member] | Commercial Bank One [Member]            
Line of credit, borrowing capacity       50,000,000    
Line Of Credit [Member] | Commercial Bank Two [Member]            
Line of credit, borrowing capacity         $ 15,000,000  
Line Of Credit [Member] | Commercial Bank One And Two [Member]            
Line of credit outstanding $ 0   0 0    
FRB PPPLF Advances [Member]            
Outstanding borrowings       124,086,000    
Warehouse Facility [Member] | Commercial Bank One [Member]            
Line of credit, borrowing capacity 25,000,000   25,000,000      
Line of credit outstanding 7,517,000   7,517,000 0    
Warehouse Facility [Member] | Commercial Bank Three [Member]            
Line of credit, borrowing capacity   $ 75,000,000        
Line of credit outstanding $ 0   $ 0 $ 62,310,000    
Minimum [Member] | Warehouse Facility [Member] | Commercial Bank One [Member] | London Interbank Offered Rate [Member]            
Variable rate spread     2.00%      
Minimum [Member] | Warehouse Facility [Member] | Commercial Bank Three [Member] | London Interbank Offered Rate [Member]            
Variable rate spread   1.75%        
Maximum [Member] | Warehouse Facility [Member] | Commercial Bank One [Member] | London Interbank Offered Rate [Member]            
Variable rate spread     4.00%      
Maximum [Member] | Warehouse Facility [Member] | Commercial Bank Three [Member] | London Interbank Offered Rate [Member]            
Variable rate spread   3.50%