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Note 8 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Average Recorded Investment | $ 97,153 | $ 123,851 | $ 110,315 | $ 127,756
Interest Income Recognized | 618 | 1,145 | 1,976 | 3,188
Commercial Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 38,659 | 48,772 | 41,132 | 46,920
Interest Income Recognized | 208 | 461 | 705 | 1,152
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 4,662 | 5,980 | 4,734 | 7,490
Interest Income Recognized | 0 | 0 | 0 | 0
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 40,699 | 55,375 | 51,323 | 59,314
Interest Income Recognized | 332 | 576 | 1,034 | 1,757
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Average Recorded Investment | 13,133 | 13,724 | 13,126 | 14,032
Interest Income Recognized | $ 78 | $ 108 | $ 237 | $ 279

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