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Note 4 - Investment Securities (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Proceeds from Sale of Mortgage Backed Securities (MBS) categorized as Available-for-sale | $ 501,100,000 | $ 759,700,000 | $ 1,040,000,000
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) | 118,100,000 | 108,400,000 | 308,200,000
Proceeds From Sales and Repayments of Other Investment Securities | 61,000,000 | 525,000,000 | 65,100,000
Proceeds From Maturities Repayments And Calls Of Held For Investment | 552,100,000 | 435,000,000 | 2,880,000,000
Realized Gain From Sale and Call of Investment Securities | 18,600,000 | 21,100,000 | 19,300,000
Realized Loss From Sale and Call of Investment Securities | 607,000 | 0 | 67,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Percentage of Nonperforming Assets | 16.90% |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Less Than Twelve Months | 2.40% |  |
Percentage of Unrealized Losses for Securities with Unrealized Losses for Greater than Twelve Months | 4.40% |  |
Pledged Investment Securities | $ 1,450,000,000 | $ 1,680,000,000 |
Twelve Months or Longer [Member] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 34 |  |
Less than Twelve Months [Member] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 7 |  |

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- Definition Pledged investment securities at carrying value. + References No definition available. + Details
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- Definition Realized gain from sale and call of investment securities + References No definition available. + Details
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- Definition Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph b(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph b(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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