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Subordinated Debentures (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Dec. 31, 2018
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2003
Subsidiary, Sale of Stock [Line Items]        
Subordinated debentures   $ 14,854,000 $ 14,844,000 $ 5,155,000
Holding Company's investment in the common stock       $ 155,000
Private Placement [Member]        
Subsidiary, Sale of Stock [Line Items]        
Holding Company, closed a pooled private offering       5,000
Trust preferred securities with a liquidation amount       $ 1
Subordinated Debentures [Member]        
Subsidiary, Sale of Stock [Line Items]        
Maturity date   Dec. 30, 2033    
Required principal payments over next five years   $ 0    
Number of years with no principal repayment   5 years    
Maximum number of years for deferred interest payments   5 years    
Subordinated Debentures [Member] | Subordinated Debentures Maturing On December 30, 2033 [Member]        
Subsidiary, Sale of Stock [Line Items]        
Holding Company may redeem the subordinated debentures in a principal amount with integral multiples       $ 1
Percentage in which holding company redeem subordinated debentures       100.00%
Trust preferred securities and subordinated debentures have a stated percentage   3.05% 3.09%  
Subordinated Debentures [Member] | Fixed-To-Floating Rate Subordinated Notes [Member] | Private Placement [Member]        
Subsidiary, Sale of Stock [Line Items]        
Maturity date Dec. 30, 2028      
Subordinated notes $ 10,000,000 $ 9,699,000    
Interest rate 7.00%      
Debt issuance costs $ 388,000      
London Interbank Offered Rate [Member] | Subordinated Debentures [Member] | Subordinated Debentures Maturing On December 30, 2033 [Member]        
Subsidiary, Sale of Stock [Line Items]        
Variable rate of interest   2.85%    
London Interbank Offered Rate [Member] | Subordinated Debentures [Member] | Fixed-To-Floating Rate Subordinated Notes [Member]        
Subsidiary, Sale of Stock [Line Items]        
Subordinated notes   $ 9,612,000    
London Interbank Offered Rate [Member] | Subordinated Debentures [Member] | Fixed-To-Floating Rate Subordinated Notes [Member] | Private Placement [Member]        
Subsidiary, Sale of Stock [Line Items]        
Variable rate of interest 4.14%