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Preferred and Common Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]        
Proceeds from issuance of CPP Shares $ 25      
Purchase 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      
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
Term of warrants issued (in years)       10
Assumptions used in determining fair value of warrants, common stock price (in dollars per share)       $ 16.6
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      
Common Stock        
Number of shares available to directors and employees for stock purchase or savings and investment plans (in shares)       700,000
Number of shares issued under employee savings and investment plan (in shares)       522,411
Number of shares available for future use under employee savings and investment plan (in shares)       177,589
Number of shares issued during period, employee benefit plan (in shares) 12,451 12,775 12,334  
Number of shares registered with SEC for dividend reinvestment plan (in shares)       600,000
Number of trading days immediately preceding dividend payment date used in determining per share price of shares purchased 5      
Number of shares issued during period, dividend reinvestment plan (in shares) 14,056 14,387 16,520