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Preferred and Common Stock (Details) (USD $)
 0 Months Ended 12 Months Ended 36 Months Ended 0 Months Ended
Mar. 28, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
May 08, 2013
Series A Preferred Stock
Mar. 27, 2013
Series A Preferred Stock
Aug. 24, 2011
Series A Preferred Stock
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                
Proceeds from issuance of CPP Shares   $ 25,000,000            
Purchase price of CPP Shares (in dollars per share)   $ 1,000     $ 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%            
Dividend payment terms   payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year            
Number of shares of common stock issuable pursuant to the Warrants, maximum (in shares)   225,904 225,904 225,904 225,904      
Exercise price of the Warrants (in dollars per share)   16.60     16.60      
Term of warrants issued (in years)   10 years            
Assumptions used in determining fair value of warrants, common stock price (in dollars per share)   $ 16.60     $ 16.60      
Assumptions used in determining fair value of warrants, dividend yield (in hundredths)   4.70%            
Assumptions used in determining fair value of warrants, stock price volatility (in hundredths)   24.43%            
Assumptions used in determining fair value of warrants, risk-free interest rate (in hundredths)   2.01%            
Expected life of CPP Shares upon issuance (in years)   5 years            
Common stock                
Payments for Repurchase of Preferred Stock and Preference Stock   12,500,000 0 12,500,000   10,000,000 2,500,000 12,500,000
Number of shares available to directors and employees for stock purchase or savings and investment plans (in shares)   700,000     700,000      
Number of shares issued under employee savings and investment plan (in shares)   533,796     533,796      
Number of shares available for future use under employee savings and investment plan (in shares)   166,204     166,204      
Number of shares issued during period, employee benefit plan (in shares)   11,385 12,451 12,775        
Number of shares registered with SEC for dividend reinvestment plan (in shares)   600,000     600,000      
Stock Remaining under Plan, Shares, Dividend Reinvestment Plan   387,412            
Number of trading days immediately preceding dividend payment date used in determining per share price of shares purchased   5 days            
Number of shares issued during period, dividend reinvestment plan (in shares)   12,008 14,056 14,387 212,588      
Proceeds from sale of common stock (in shares) 760,771              
Proceeds from sale of common stock 11,649,000 11,973,000 499,000 431,000        
Preferred Stock, Value, Outstanding $ 10,000,000