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Note 6 - Investment Securities (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Collateralized Mortgage Backed Securities [Member] | Dec. 31, 2013 Collateralized Mortgage Backed Securities [Member] | Sep. 30, 2014 Corporate Bonds Issued By Financial Institutions [Member] | Sep. 30, 2014 Preferred Stock of Government Sponsored Entities [Member]
Note 6 - Investment Securities (Details) [Line Items] |  |  |  |  |  |  |  |
Investment Securities |  | $ 1,340,000,000 |  | $ 1,590,000,000 |  |  |  |
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 |  | 458,400,000 | 348,700,000 |  |  |  |  |
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) |  | 54,700,000 | 237,900,000 |  |  |  |  |
Proceeds From Sales and Repayments of Other Investment Securities |  | 84,900,000 | 555,200,000 |  |  |  |  |
Proceeds From Maturities Repayments And Calls Of Held For Investment |  | 585,800,000 | 180,100,000 |  |  |  |  |
Realized Gain From Sale and Call of Investment Securities |  | 17,100,000 | 27,200,000 |  |  |  |  |
Realized Loss From Sale and Call of Investment Securities |  | 9,500,000 | 0 |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 22,674,000 |  | 69,808,000 | 21,073,000 | 64,529,000 | 1,400,000 |
Temporarily Impaired Securities As Percentage of Investment Securities |  | 66.30% |  |  |  |  |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Less Than Twelve Months |  | 0.07% |  |  |  |  |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months |  | 3.50% |  |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  |  |  |  |  |  | 820,000
Pledged Investment Securities |  | $ 703,600,000 |  | $ 926,500,000 |  |  |  |

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