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Note 6 - Investment Securities (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Note 6 - Investment Securities (Details) [Line Items] |  |  |  |
Investment Securities |  | $ 1,700,000,000 |  | $ 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 |  | 348,700,000 | 369,000,000 |
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) |  | 237,900,000 | 280,700,000 |
Proceeds From Sales and Repayments of Other Investment Securities |  | 555,200,000 | 61,000,000 |
Proceeds From Maturities Repayments And Calls Of Held For Investment |  | 180,100,000 | 494,200,000 |
Realized Gain From Sale and Call of Investment Securities |  | 27,200,000 | 13,800,000 |
Realized Loss From Sale and Call of Investment Securities |  |  | 607,000 |
Temporarily Impaired Securities As Percentage of Investment Securities |  | 58.60% |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Less Than Twelve Months |  | 4.90% |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months |  | 5.60% |  |
Pledged Investment Securities |  | $ 941,800,000 |  | $ 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 |  | 14 |  |

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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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