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Preferred Stock (Details) - USD ($)
 2 Months Ended 3 Months Ended
Jul. 15, 2014
May 12, 2014
Jul. 15, 2014
Mar. 31, 2018
Dec. 31, 2017
Schedule of Capitalization, Equity [Line Items]          
Aggregate value      
Share conversion, original shares converted         480,000
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       $ 25.00  
Series B Preferred Stock [Member]          
Schedule of Capitalization, Equity [Line Items]          
Preferred Stock Shares Issued       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 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 [Member]          
Schedule of Capitalization, Equity [Line Items]          
Shares issued upon conversion         6,857,143