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Summary of Significant Accounting Policies and Activities (Details)
Dec. 31, 2020
USD ($)
Investments
Mar. 16, 2020
Mar. 03, 2020
Dec. 31, 2019
USD ($)
Effect of Fourth Quarter Events [Line Items]        
Real estate loan percentage of total loan 84.60%     82.80%
Federal reserve reduced target federal funds rate basis point   1.00% 0.50%  
Investment in trusts $ 403,000      
Cash and cash equivalents 12,600,000     $ 6,000,000.0
Line of credit borrowing capacity 118,500,000      
Line of credit $ 15,000,000.0      
Commercial [Member]        
Effect of Fourth Quarter Events [Line Items]        
Total number of loans added under troubled debt restructurings (TDRs) | Investments 6      
Financial difficulty (TDR) [Member]        
Effect of Fourth Quarter Events [Line Items]        
Short-term loan deferrals $ 3,200,000      
Holding Company Line of Credit [Member]        
Effect of Fourth Quarter Events [Line Items]        
Line of credit borrowing capacity $ 15,000,000.0