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Subordinated Debentures (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 15, 2008
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
item
$ / shares
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Private placement offering price (per unit) | $ / shares   $ 100  
Subordinated debentures   $ 20,619 $ 20,619
Severn Capital Trust I [Member]      
Debt Instrument [Line Items]      
Common equity owned   100.00%  
Series A Preferred Stock      
Debt Instrument [Line Items]      
Number of private placement offering | shares 70    
Private placement offering price (per unit) | $ / shares $ 100,000    
Gross proceeds of private placement $ 7,000    
Number of shares issued in private placement for each unit (in shares) | shares 6,250    
Junior Subordinated Debt Securities [Member]      
Debt Instrument [Line Items]      
Principal amount of debt   $ 20,600 $ 20,600
Maturity date   Jan. 07, 2035  
Basis spread on variable rate   2.00%  
Permitted number of consecutive quarterly interest payment deferment period | item   20  
Junior Subordinated Debt Securities [Member] | LIBOR      
Debt Instrument [Line Items]      
Term of variable rate   3 months