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Preferred and Common Stock (Details) (USD $) | 0 Months Ended | 3 Months Ended | 0 Months Ended | 48 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 28, 2013 | Mar. 31, 2013 executive_officer | Mar. 31, 2012 | Mar. 27, 2013 Series A Preferred Stock [Member] | Aug. 24, 2011 Series A Preferred Stock [Member] | Jan. 09, 2013 Series A Preferred Stock [Member] | Aug. 25, 2011 Series A Preferred Stock [Member] | Jan. 09, 2009 Series A Preferred Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of CPP Shares |  |  |  |  |  | $ 25,000,000 |  |
Repurchase 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 years |  |
CPP Shares dividend rate after first five years (in hundredths) |  |  |  |  |  | 9.00% |  |
Repurchase of fixed rate perpetual preferred stock, series A |  | 2,500,000 | 0 | 2,500,000 | 12,500,000.0 |  |  |
Outstanding CPP shares - value | 10,000,000 | 10,000,000 |  |  |  |  | 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) |  | 16.60 |  |  |  |  |  |
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 |  | 4.70% |  |  |  |  |  |
Assumptions used in determining fair value of warrants, stock price volatility |  | 24.43% |  |  |  |  |  |
Assumptions used in determining fair value of warrants, risk-free interest rate |  | 2.01% |  |  |  |  |  |
Expected life of CPP Shares upon issuance |  | 5 years |  |  |  |  |  |
Number of other most highly compensated executive officers |  | 3 |  |  |  |  |  |
Limit on tax deductions for compensation expense for each executive officer |  | 500,000 |  |  |  |  |  |
Proceeds from sale of common stock (in shares) | 760,771 |  |  |  |  |  |  |
Proceeds from sale of common stock | $ 11,649,000 | $ 11,649,000 | $ 183,000 |  |  |  |  |

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