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Preferred and Common Stock (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Preferred Stock [Abstract]    
Proceeds from issuance of CPP Shares $ 25,000,000  
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) 5Y  
CPP Shares dividend rate after first five years (in hundredths) 9.00%  
Dividend payment terms The CPP Shares call for cumulative dividends at a rate of 5.0% per year for the first five years, and at a rate of 9.0% per year in following years, payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year.  
Repurchase of fixed rate perpetual preferred stock, series A 0 12,500,000
Repurchase price of CPP shares (in dollars per share) $ 1,000  
Outstanding CPP shares - value 12,500,000  
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) $ 16.6  
Term of warrants issued (in years) 10Y  
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  
Number of other most highly compensated executive officers 3  
Limit on tax deductions for compensation expense for each executive officer $ 500,000