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Note 6 - Investment Securities (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Investment Securities | $ 2,200,000,000 |  | $ 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 | 0 | 117,600,000 |
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) | 98,400,000 | 94,200,000 |
Proceeds From Sales and Repayments of Other Investment Securities | 320,200,000 | 30,600,000 |
Proceeds From Maturities Repayments And Calls Of Held For Investment | 10,100,000 | 200,000,000 |
Realized Gain From Sale and Call of Investment Securities | 6,300,000 | 2,800,000 |
Realized Loss From Sale and Call of Investment Securities | 0 | 595,000 |
Temporarily Impaired Securities As Percentage of Investment Securities | 24.20% |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Less Than Twelve Months |  |  | 0.50%
Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months |  |  | 4.40%
Pledged Investment Securities | $ 1,360,000,000 |  | $ 1,450,000,000
Corporate Bonds Issued By Financial Institutions [Member] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 27 |  |

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