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Preferred Stock (Details)
 1 Months Ended 2 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
Jul. 15, 2014
USD ($)
shares
Dec. 31, 2017
USD ($)
Mar. 31, 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   480,000  
Aggregate value     $ 12,000,000 $ 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      
Common Stock                  
Schedule of Capitalization, Equity [Line Items]                  
Shares issued upon conversion | shares   6,857,143              
Shares post-reverse-split | shares   1,246,753