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Note 13 - Stockholders' Equity and Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | 2013 |
|  | Pre-tax |  |  | Tax expense |  |  | Net-of-tax |
Beginning balance, net of tax |  |  |  |  |  |  |  |  |  | $ | 465 |
Net unrealized losses arising during the period |  | $ | (117,515 | ) |  | $ | (49,407 | ) |  | $ | (68,108 | )
Reclassification adjustment for net securities gains included in net income |  |  | 27,362 |  |  |  | 11,503 |  |  |  | 15,859 |
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale |  |  | 38,052 |  |  |  | 15,997 |  |  |  | 22,055 |
Total other comprehensive income |  | $ | (52,101 | ) |  | $ | (21,907 | ) |  | $ | (30,194 | )
Ending balance, net of tax |  |  |  |  |  |  |  |  |  | $ | (29,729 | )
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
|  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |  |  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |  |  | Income (Numerator) |  |  | Shares (Denominator) |  |  | Per Share Amount |
|  | (In thousands, except shares and per share data) |
Net income |  | $ | 123,143 |  |  |  |  |  |  |  |  |  |  | $ | 117,438 |  |  |  |  |  |  |  |  |  |  | $ | 100,150 |  |  |  |  |  |  |  |  |
Dividends on preferred stock |  |  | (9,685 | ) |  |  |  |  |  |  |  |  |  |  | (16,488 | ) |  |  |  |  |  |  |  |  |  |  | (16,437 | ) |  |  |  |  |  |  |  |
Basic EPS, income/(loss) |  | $ | 113,458 |  |  |  | 78,954,898 |  |  | $ | 1.44 |  |  | $ | 100,950 |  |  |  | 78,719,133 |  |  | $ | 1.28 |  |  | $ | 83,713 |  |  |  | 78,633,317 |  |  | $ | 1.06 |
Effect of dilutive stock options |  |  |  |  |  |  | 183,085 |  |  |  |  |  |  |  |  |  |  |  | 4,164 |  |  |  |  |  |  |  |  |  |  |  | 7,335 |  |  |  |  |
Diluted EPS, income/(loss) |  | $ | 113,458 |  |  |  | 79,137,983 |  |  | $ | 1.43 |  |  | $ | 100,950 |  |  |  | 78,723,297 |  |  | $ | 1.28 |  |  | $ | 83,713 |  |  |  | 78,640,652 |  |  | $ | 1.06 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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