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Note 10 - Borrowed Funds (Details) - Comparative Data for Securities Sold Under Agreements to Repurchase (Securities Sold under Agreements to Repurchase [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) - Comparative Data for Securities Sold Under Agreements to Repurchase [Line Items] |  |  |  |  |  |
Average amount outstanding during the year (1) | $ 972,329 | [1] | $ 1,361,475 | [1] | $ 1,448,363 | [1]
Maximum amount outstanding at month-end (2) | 1,200,000 | [2] | 1,400,000 | [2] | 1,559,000 | [2]
Balance, December 31 | $ 800,000 |  | $ 1,250,000 |  | $ 1,400,000 |
Rate, December 31 | 3.87% |  | 3.84% |  | 4.14% |
Weighted average interest rate for the year | 3.88% |  | 4.09% |  | 4.19% |
[1] | Average balances were computed using daily averages.
[2] | Highest month-end balances were January 2013, January 2012, and January 2011.

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