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Note 6 - Investment Securities (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Note 6 - Investment Securities (Details) [Line Items] |  |  |  |
Investment Securities |  | $ 2,000,000,000 |  | $ 2,100,000,000
Held-to-maturity Securities, Transferred Security, at Carrying Value |  | 722,500,000 |  |
Held-to-maturity Securities, Transferred Security, Unrealized Gain (Loss) | 40,500,000 |  |  |
Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale |  | 113,600,000 | 179,500,000 |
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) |  | 179,000,000 | 178,100,000 |
Proceeds From Sales and Repayments of Other Investment Securities |  | 440,100,000 | 41,100,000 |
Proceeds From Maturities Repayments And Calls Of Held For Investment |  | 80,100,000 | 470,800,000 |
Realized Gain From Sale and Call of Investment Securities |  | 18,500,000 | 5,200,000 |
Realized Loss From Sale and Call of Investment Securities |  |  | 608,000 |
Temporarily Impaired Securities As Percentage of Investment Securities |  | 58.00% |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Less Than Twelve Months |  | 4.30% |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months |  | 4.60% |  |
Pledged Investment Securities |  | $ 1,120,000,000 |  | $ 1,450,000,000
Corporate Bonds Issued By Financial Institutions [Member] |  |  |  |
Note 6 - Investment Securities (Details) [Line Items] |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 15 |  |

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- Definition Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months + References No definition available. + Details
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- Definition For any transfer of securities categorized as held-to-maturity, this item represents the net carrying amount of the transferred security to another category of investments in debt and equity securities (trading or available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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