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Note 9 - Borrowed Funds (Details) (USD $) | 9 Months Ended |  |  |  | 9 Months Ended |  |  |  | 9 Months Ended |
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2014 Callable Securities [Member] | Sep. 30, 2014 Securities Sold under Agreements to Repurchase [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member] | Jun. 30, 2014 Securities Sold Under Agreements to Repurchase Minimum [Member] | Jun. 30, 2014 Securities Sold Under Agreements to Repurchase Maximum Initial Rate [Member] | Sep. 30, 2014 Floating to Fixed Rate Agreements Totaling $300 Million [Member] Maximum [Member] | Sep. 30, 2014 Floating to Fixed Rate Agreements Totaling $300 Million [Member] Minimum [Member] | Sep. 30, 2014 Floating to Fixed Rate Agreements Totaling $300 Million [Member] | Sep. 30, 2014 Securities Sold under Agreements to Repurchase [Member] | Dec. 31, 2013 Securities Sold under Agreements to Repurchase [Member] | Sep. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] Minimum [Member] | Sep. 30, 2014 Minimum [Member]
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Sold under Agreements to Repurchase (in Dollars) | $ 550,000,000 | $ 800,000,000 |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |
Weighted Average Rate Of Securities Sold Under Agreements | 3.78% | 3.87% |  |  |  |  |  |  |  |  |  |  |  |
Prepaid Security Sold Under Repurchase Agreement (in Dollars) | 100,000,000 |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Rate of Prepaid Security Sold Under Repurchase Agreements | 3.50% |  | 3.97% |  |  |  |  |  |  |  |  |  |  |
Prepayment Penalty Security Sold Under Agreements To Repurchase (in Dollars) | 3,400,000 |  | 15,700,000 |  |  |  |  |  |  |  |  |  |  |
Number Of Floating-To-Fixed Rate Agreements |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Total Floating To Fixed Rate (in Dollars) |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 3.40% |  |  |  |  |  |  |  | 3.50% |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 1.00% | 3.50% | 5.07% | 4.89% |  |  |  |  | 8.00%
Number Of Fixed-To-Floating Security Sold Under Agreements To Repurchase | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Total Fixed To Floating Rate Agreements (in Dollars) | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Securities Pledged As Collateral (in Dollars) |  |  |  |  |  |  |  |  |  |  | 629,300,000 | 906,100,000 |  |
Advances from Federal Home Loan Banks (in Dollars) | $ 555,000,000 | $ 521,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Weighted Average Interest Rate | 0.12% | 0.17% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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