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Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | $ 207,295 | $ 56,619
Less than 12 Months Unrealized Losses | 1,870 | 242
12 Months or Greater Estimated Fair Value | 58,954 | 98,693
12 Months or Greater Unrealized Losses | 1,722 | 2,435
Total Estimated Fair Value | 266,249 | 155,312
Total Unrealized Losses | 3,592 | 2,677
US Government Agencies Debt Securities [Member] |  |
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | 32,927 | 2,001
Less than 12 Months Unrealized Losses | 277 | 7
12 Months or Greater Estimated Fair Value | 0 | 1,750
12 Months or Greater Unrealized Losses | 0 | 33
Total Estimated Fair Value | 32,927 | 3,751
Total Unrealized Losses | 277 | 40
Residential Mortgage Backed Securities [Member] |  |
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | 157,871 | 49,644
Less than 12 Months Unrealized Losses | 1,438 | 221
12 Months or Greater Estimated Fair Value | 58,954 | 86,028
12 Months or Greater Unrealized Losses | 1,722 | 2,295
Total Estimated Fair Value | 216,825 | 135,672
Total Unrealized Losses | 3,160 | 2,516
US States and Political Subdivisions Debt Securities [Member] |  |
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | 1,559 | 4,974
Less than 12 Months Unrealized Losses | 3 | 14
12 Months or Greater Estimated Fair Value | 0 | 10,915
12 Months or Greater Unrealized Losses | 0 | 107
Total Estimated Fair Value | 1,559 | 15,889
Total Unrealized Losses | 3 | $ 121
Corporate Debt Securities [Member] |  |
Note 4 - Investment Securities Available-for-sale (Details) - Securities in Continuous Unrealized Loss Position [Line Items] |  |
Less than 12 Months Estimated Fair Value | 14,938 |
Less than 12 Months Unrealized Losses | 152 |
12 Months or Greater Estimated Fair Value | 0 |
12 Months or Greater Unrealized Losses | 0 |
Total Estimated Fair Value | 14,938 |
Total Unrealized Losses | $ 152 |

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