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Note 5 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Average Recorded Investment | $ 122,596 | $ 127,067 | $ 131,019
Contractual interest due | 3,166 | 3,302 | 3,462
Commercial Portfolio Segment [Member] |  |  |
Average Recorded Investment | 44,486 | 26,957 | 21,199
Contractual interest due | 685 | 1,303 | 767
Real Estate Construction Portfolio Segment [Member] |  |  |
Average Recorded Investment | 6,835 | 26,695 | 10,362
Contractual interest due |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Average Recorded Investment | 57,596 | 58,635 | 81,905
Contractual interest due | 2,125 | 1,618 | 2,214
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |
Average Recorded Investment | 13,679 | 14,780 | 17,553
Contractual interest due | $ 356 | $ 381 | $ 481

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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=84173941&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=84173941&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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