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Note 9 - Securities Sold Under Agreements to Repurchase (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
Securities Sold under Agreements to Repurchase (in Dollars) | $ 1,150,000,000 | $ 1,250,000,000 | $ 1,250,000,000
Weighted Average Rate Of Securities Sold Under Agreements | 3.78% |  |
Average Rate Reduction on Modified Repurchase Agreements (in Basis Points) |  | 1.68% |
Prepaid Security Sold Under Repurchase Agreement (in Dollars) | 100,000,000 | 150,000,000 |
Rate of Prepaid Security Sold Under Repurchase Agreements | 4.61% | 4.43% |
Prepayment Penalty Security Sold Under Agreements To Repurchase (in Dollars) | 5,600,000 | 9,400,000 |
Number Of Fixed-To-Floating Security Sold Under Agreements To Repurchase | 13 |  |
Total Fixed To Floating Rate Agreements (in Dollars) | 650,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.00% |  |
Securities Sold Under Agreements to Repurchase Minimum [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.00% |  |
Securities Sold Under Agreements to Repurchase Maximum Initial Rate [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50% |  |
Floating to Fixed Rate Agreements Totaling $400 Million [Member] |  |  |
LIBOR Minus Hundred Basis Point | LIBOR minus 200 |  |
Callable Securities [Member] |  |  |
Securities Sold under Agreements to Repurchase (in Dollars) | 950,000,000 |  |
Minimum [Member] | Floating to Fixed Rate Agreements Totaling $400 Million [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.78% |  |
Minimum [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  |
Debt Instrument, Basis Spread on Variable Rate | 3.25% |  |
Maximum [Member] | Floating to Fixed Rate Agreements Totaling $400 Million [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.07% |  |
Maximum [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.79% |  |
Securities Sold under Agreements to Repurchase [Member] |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 3.84% |
Investment Securities Pledged As Collateral (in Dollars) | 1,300,000,000 | 1,400,000,000 |
Terms Modified in Current Year [Member] |  |  |
Securities Sold under Agreements to Repurchase (in Dollars) |  | 200,000,000 |
Floating to Fixed Rate Agreements Totaling $400 Million [Member] |  |  |
Number Of Floating-To-Fixed Rate Agreements | 5 |  |
Total Floating To Fixed Rate (in Dollars) | $ 300,000,000 |  |
LIBOR Minus Three Hundred and Forty Basis Points | three-month LIBOR minus 340 |  |

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 100 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 36 -IssueDate 2006-05-01 -Chapter 4 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7472769&loc=d3e9760-107771 + Details
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