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Preferred Stock (Details)
 1 Months Ended 3 Months Ended
Aug. 20, 2018
Sep. 29, 2017
shares
Jul. 15, 2014
USD ($)
shares
May 12, 2014
USD ($)
shares
Apr. 30, 2014
$ / shares
shares
Dec. 31, 2017
USD ($)
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Schedule of Capitalization, Equity [Line Items]                
Aggregate value            
Share conversion, original shares converted | shares   480,000            
Reverse stock split ratio 5.5              
Non-Cumulative Convertible Perpetual Preferred Stock Series B [Member] | Private Placement [Member]                
Schedule of Capitalization, Equity [Line Items]                
Preferred stock rate         6.25%      
Price per share | $ / shares         $ 25.00      
Series B Preferred Stock [Member]                
Schedule of Capitalization, Equity [Line Items]                
Preferred Stock Shares Issued | shares             0 0
Stock conversion, estimated preferred stock dividends eliminated quarterly           $ 187,500    
Stock conversion, estimated preferred stock dividends eliminated annually           $ (750,000)    
Series B Preferred Stock [Member] | Private Placement [Member]                
Schedule of Capitalization, Equity [Line Items]                
Preferred Stock Shares Issued | shares     480,000 480,000 480,000   480,000  
Aggregate value     $ 12,000,000 $ 12,000,000        
Expenses for issuance of stock     482,000 482,000        
Other offering expenses     149,000 149,000        
Proceeds from Issuance of Private Placement     $ 11,369,000 $ 11,369,000        
Common Stock                
Schedule of Capitalization, Equity [Line Items]                
Shares issued upon conversion | shares   6,857,143            
Shares post-reverse-split | shares   1,246,753