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FHLB Advances And Other Debt (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
PPPLF fixed rate 0.35%      
Weighted average life 1 year 1 month 6 days   1 year 2 months 12 days  
Number of PPP loans processed | loan     558  
Total amount of PPP loans processed     $ 126,000,000  
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   4,500,000  
Outstanding balance 4,375,000      
Line Of Credit [Member] | Third-Party Bank [Member]        
Outstanding balance 5,000,000      
Line of credit, outstanding balance     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 balance 0   0  
FRB PPPLF Advances [Member]        
Outstanding borrowings 90,573,000   107,413,000  
Warehouse Facility One [Member] | Commercial Bank [Member]        
Line of credit, borrowing capacity   $ 25,000,000   $ 25,000,000
Line of credit, outstanding balance 0   0  
Warehouse Facility One [Member] | Commercial Bank Three [Member]        
Line of credit, borrowing capacity     75,000,000  
Line of credit, outstanding balance $ 13,946,000   $ 70,013,000  
Minimum [Member] | Warehouse Facility One [Member] | Commercial Bank [Member] | London Interbank Offered Rate [Member]        
Variable rate spread   2.00%    
Minimum [Member] | Warehouse Facility One [Member] | Commercial Bank Three [Member] | London Interbank Offered Rate [Member]        
Variable rate spread     2.35%  
Maximum [Member] | Warehouse Facility One [Member] | Commercial Bank [Member] | London Interbank Offered Rate [Member]        
Variable rate spread       4.00%
Maximum [Member] | Warehouse Facility One [Member] | Commercial Bank Three [Member] | London Interbank Offered Rate [Member]        
Variable rate spread     2.90%