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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 |

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