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Note 4 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Average Recorded Investment | $ 102,583 | $ 122,596 | $ 127,067
Contractual interest due | 2,084 | 3,166 | 3,302
Commercial Portfolio Segment [Member] |  |  |
Average Recorded Investment | 37,475 | 44,486 | 26,957
Contractual interest due | 412 | 685 | 1,303
Real Estate Construction Portfolio Segment [Member] |  |  |
Average Recorded Investment | 4,697 | 6,835 | 26,695
Contractual interest due | 0 | 0 | 0
Commercial Real Estate Portfolio Segment [Member] |  |  |
Average Recorded Investment | 47,612 | 57,596 | 58,635
Contractual interest due | 1,366 | 2,125 | 1,618
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |
Average Recorded Investment | 12,799 | 13,679 | 14,780
Contractual interest due | $ 306 | $ 356 | $ 381

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524 + Details
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