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Note 9 - Borrowed Funds (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Summary of Comparative Data of Securities Sold under Agreements to Repurchase [Table Text Block] |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (Dollars in thousands) |
Average amount outstanding during the year (1) |  | $ | 381,967 |  |  | $ | 400,822 |  |  | $ | 629,315 |
Maximum amount outstanding at month-end (2) |  |  | 400,000 |  |  |  | 400,000 |  |  |  | 700,000 |
Balance, December 31 |  |  | 350,000 |  |  |  | 400,000 |  |  |  | 450,000 |
Rate, December 31 |  |  | 4.06 | % |  |  | 3.89 | % |  |  | 3.85 | %
Weighted average interest rate for the year |  |  | 4.01 | % |  |  | 3.95 | % |  |  | 3.92 | %

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