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Note 13 - Stockholders' Equity and Earnings per Share (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 05, 2008 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2004 | Dec. 31, 2012 Stock Options [Member] | Dec. 31, 2011 Stock Options [Member] | Dec. 31, 2012 Warrant [Member] | Dec. 31, 2011 Warrant [Member] | Dec. 31, 2011 Restricted Stock [Member] | Dec. 31, 2012 Series A Non-Cumulative Preferred Stock [Member] | Dec. 31, 2011 Series A Non-Cumulative Preferred Stock [Member] | Dec. 31, 2010 Series A Non-Cumulative Preferred Stock [Member] | Dec. 31, 2012 First Five Years [Member] | Dec. 31, 2012 After Five Years [Member]
Regulation Restricted On Amount Of Retained Earnings Available For Cash Dividends (in Dollars) |  | $ 80,800,000 |  |  |  |  |  |  |  | $ 80,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock (in Dollars) | 258,000,000 |  |  |  |  |  |  |  |  |  |  |  | 8,600,000 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  | 5.00% | 9.00%
Dividends, Preferred Stock (in Dollars) |  | $ (4,127,000) | $ (4,123,000) | $ (4,121,000) | $ (4,117,000) | $ (4,114,000) | $ (4,111,000) | $ (4,107,000) | $ (4,105,000) | $ 16,488,000 | $ 16,437,000 | $ 16,388,000 |  |  |  |  |  |  | $ 605,000 | $ 605,000 | $ 611,000 |  |
Sale of Stock, Price Per Share (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 8.80 |  |  |  |  |  |  |  |  | $ 200 |  |
Common Stock Aggregate Market Price Percentage Of Senior Preferred Stock |  | 15.00% |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 258,000 |  |  |  | 258,000 |  |  |  | 258,000 | 258,000 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 1,846,374 |  |  |  |  |  |  |  | 1,846,374 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item) |  | 20.96 |  |  |  |  |  |  |  | 20.96 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Aggregate Market Price (in Dollars per share) |  | $ 38.7 |  |  |  |  |  |  |  | $ 38.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 4,400,000 | 1,800,000 | 1,800,000 | 103,000 |  |  |  |  |

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