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Note 16 - Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2013
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Three months ended March 31, 2013 |
|  | Pre-tax |  |  | Tax expense |  |  | Net-of-tax |
|  | (In thousands) |
Beginning balance, net of tax |  |  |  |  |  |  |  | $ | 465 |
Net unrealized gains arising during the period |  | $ | 7,947 |  |  | $ | 3,343 |  |  | $ | 4,604 |
Reclassification adjustment for net securities gains included in net income |  |  | (6,292 | ) |  |  | (2,645 | ) |  |  | (3,647 | )
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale |  |  | 38,052 |  |  |  | 15,997 |  |  |  | 22,055 |
Total other comprehensive income |  | $ | 39,707 |  |  | $ | 16,695 |  |  | $ | 23,012 |
Ending balance, net of tax |  |  |  |  |  |  |  |  |  | $ | 23,477 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration