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Shareholders' Equity Transactions (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended 28 Months Ended
Oct. 16, 2015
Jun. 25, 2015
Dec. 21, 2012
Jan. 31, 2013
Sep. 30, 2011
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2011
Dec. 31, 2015
Dec. 31, 2013
Preferred stock dividends           $ 58,000 $ 217,000      
Small Business Lending Fund [Member]                    
Preferred stock redeemed               $ 63,500,000    
Stock issued               $ 63,500,000    
Stock issued, shares               63,500    
Liquidation value of shares               $ 1,000    
Threshold for qualified community banks               $ 10,000,000,000    
Series C Preferred Stock [Member]                    
Stock issued, shares     728,706              
Preferred stock, no par value per share. Authorized: 5,000,000 shares Series B issued & outstanding: 0, 63,500, and 63,500 shares Series C, convertible, issued & outstanding: 0, 728,706, and 728,706 shares           $ 7,287,000 $ 7,287,000   $ 7,287,000  
Preferred stock, shares outstanding           728,706 728,706   728,706  
Stock sold price per share     $ 10.00              
Accrued dividends           $ 58,000 $ 58,000      
Series B Preferred Stock [Member]                    
Preferred stock, no par value per share. Authorized: 5,000,000 shares Series B issued & outstanding: 0, 63,500, and 63,500 shares Series C, convertible, issued & outstanding: 0, 728,706, and 728,706 shares           $ 63,500,000    
Preferred stock, shares outstanding           63,500    
Series B Preferred Stock [Member] | Small Business Lending Fund [Member]                    
Preferred stock redeemed $ 31,500,000 $ 32,000,000                
Preferred stock redeemed, shares 31,500 32,000                
Liquidation value of shares $ 1,000 $ 1,000                
Preferred stock dividend rate       1.00%   1.00%   5.00%    
Preferred stock dividend rate after five years         9.00%          
Accrued dividends             $ 159,000      
Series B Preferred Stock [Member] | Small Business Lending Fund [Member] | Minimum [Member]                    
Preferred stock dividend rate                 1.00% 1.00%
Series B Preferred Stock [Member] | Small Business Lending Fund [Member] | Maximum [Member]                    
Preferred stock dividend rate                 7.00% 5.00%
Common Stock [Member]                    
Stock issued, shares     2,656,294              
Common Stock [Member] | Series C Preferred Stock [Member]                    
Net proceeds from the sale of preferred and common stock           $ 33,800,000