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Preferred and Common Stock (Details) (USD $)
 0 Months Ended 6 Months Ended 0 Months Ended 48 Months Ended 6 Months Ended
Mar. 28, 2013
Jun. 30, 2014
Jun. 30, 2013
May 08, 2013
Series A Preferred Stock [Member]
Mar. 27, 2013
Series A Preferred Stock [Member]
Aug. 24, 2011
Series A Preferred Stock [Member]
Jan. 09, 2013
Series A Preferred Stock [Member]
Jan. 09, 2009
Series A Preferred Stock [Member]
Jun. 30, 2014
Capital Purchase Program [Member]
Jun. 30, 2013
Capital Purchase Program [Member]
Class of Stock [Line Items]                    
Proceeds from issuance of CPP Shares             $ 25,000,000      
Repurchase price of CPP shares (in dollars per share)               $ 1,000    
Cumulative dividend rate of CPP Shares (in hundredths)             5.00%      
CPP Shares dividend period (in years)             5 years      
CPP Shares dividend rate after first five years (in hundredths)             9.00%      
Repurchase of fixed rate perpetual preferred stock, series A   0 12,500,000 10,000,000 2,500,000 12,500,000.0        
Outstanding CPP shares - value 10,000,000                  
Number of shares of common stock issuable pursuant to the Warrants, maximum (in shares)   225,904 225,904              
Exercise price of the Warrants (in dollars per share)   16.60                
Assumptions used in determining fair value of warrants, common stock price (in dollars per share)   $ 16.60                
Assumptions used in determining fair value of warrants, dividend yield   4.70%                
Assumptions used in determining fair value of warrants, stock price volatility   24.43%                
Assumptions used in determining fair value of warrants, risk-free interest rate   2.01%                
Expected life of CPP Shares upon issuance   5 years                
Proceeds from sale of common stock (in shares) 760,771                  
Proceeds from sale of common stock 11,548,000 224,000 11,751,000              
Issuance of common stock for plans   $ 224,000 $ 11,751,000           $ 224,000 $ 203,000