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Note 9 - Securities Sold Under Agreements to Repurchase (Details) (USD $) | 6 Months Ended |
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Jun. 30, 2013 | Dec. 31, 2012
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Securities Sold under Agreements to Repurchase (in Dollars) | $ 950,000,000 | $ 1,250,000,000
Weighted Average Rate Of Securities Sold Under Agreements | 3.80% | 3.84%
Average Rate Reduction on Modified Repurchase Agreements (in Basis Points) |  | 1.68%
Prepaid Security Sold Under Repurchase Agreement (in Dollars) | 300,000,000 | 150,000,000
Rate of Prepaid Security Sold Under Repurchase Agreements | 3.97% | 4.43%
Prepayment Penalty Security Sold Under Agreements To Repurchase (in Dollars) | 15,700,000 | 9,400,000
Total Fixed To Floating Rate Agreements (in Dollars) | 450,000,000 |
Number Of Fixed-To-Floating Security Sold Under Agreements To Repurchase | 9 |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.00% |
Securities Sold Under Agreements to Repurchase Minimum [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.00% |
Securities Sold Under Agreements to Repurchase Maximum Initial Rate [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50% |
Terms Modified in Current Year [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Securities Sold under Agreements to Repurchase (in Dollars) |  | 200,000,000
Floating to Fixed Rate Agreements Totaling $300 Million [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Number Of Floating-To-Fixed Rate Agreements | 5 |
Total Fixed To Floating Rate Agreements (in Dollars) | 300,000,000 |
LIBOR Minus Hundred Basis Point | LIBOR minus 200 |
LIBOR Minus Three Hundred and Forty Basis Points | three-month LIBOR rate minus 340 |
Floating to Fixed Rate Agreements Totaling $300 Million [Member] | Minimum [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.78% |
Floating to Fixed Rate Agreements Totaling $300 Million [Member] | Maximum [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.07% |
Securities Sold under Agreements to Repurchase [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Investment Securities Pledged As Collateral (in Dollars) | 1,100,000,000 | 1,400,000,000
Callable Securities [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Securities Sold under Agreements to Repurchase (in Dollars) | $ 750,000,000 |
Minimum [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |
Debt Instrument, Basis Spread on Variable Rate | 3.25% |
Maximum [Member] |  |
Note 9 - Securities Sold Under Agreements to Repurchase (Details) [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 3.75% |

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- Definition Contractual interest rate for funds borrowed, under the 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 Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 Reference 4: 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 5: 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 Reference 6: 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=26873400&loc=d3e23780-122690 + Details
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