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Note 6 - Investment Securities (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Note 6 - Investment Securities (Details) [Line Items] |  |  |
Investment Securities | $ 1,580,000,000 |  | $ 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 | 123,700,000 | 0 |
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) | 20,500,000 | 98,400,000 |
Proceeds From Sales and Repayments of Other Investment Securities | 16,000,000 | 320,200,000 |
Proceeds From Maturities Repayments And Calls Of Held For Investment | 112,900,000 | 10,100,000 |
Realized Gain From Sale and Call of Investment Securities | 6,000,000 | 6,300,000 |
Realized Loss From Sale and Call of Investment Securities | 67,000 | 0 |
Temporarily Impaired Securities As Percentage of Investment Securities | 64.40% |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Less Than Twelve Months | 5.20% |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months | 3.50% |  |
Pledged Investment Securities | 853,600,000 |  | 926,500,000
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 | 9 |  |
Collateralized Mortgage Backed Securities [Member] |  |  |
Note 6 - Investment Securities (Details) [Line Items] |  |  |
Available-for-sale Securities, Gross Unrealized Loss | $ 49,700,000 |  |

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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 Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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