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Note 8 - Loans (Details) - Average Balance and Interest Income Recognized Related to Impaired Loans - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans, average recorded investment | $ 160,349 | $ 190,744 | $ 168,472 | $ 192,752
Loans, interest income recognized | 1,152 | 1,552 | 3,221 | 4,507
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans, average recorded investment | 23,894 | 21,706 | 24,974 | 26,741
Loans, interest income recognized | 170 | 205 | 519 | 636
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans, average recorded investment | 22,392 | 33,276 | 22,056 | 33,459
Loans, interest income recognized | 66 | 66 | 196 | 198
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans, average recorded investment | 97,557 | 119,611 | 104,508 | 114,663
Loans, interest income recognized | 777 | 1,153 | 2,126 | 3,310
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Loans, average recorded investment | 16,506 | 16,151 | 16,934 | 17,889
Loans, interest income recognized | $ 139 | $ 128 | $ 380 | $ 363

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