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Preferred and Common Stock (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Preferred Stock [Abstract]    
Repurchase of fixed rate perpetual preferred stock, series A $ 12,500,000  
Repurchase price of CPP shares (in dollars per share) $ 1,000  
Outstanding CPP shares - value 12,500,000  
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 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
Exercise price of the Warrants (in dollars per share) $ 16.60  
Number of other most highly compensated executive officers 3  
Limit on tax deductions for compensation expense for each executive officer $ 500,000  
Term of warrants issued (in years) 10Y  
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 (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