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Note 5 - Loans and Allowance for Loan Losses - Impairment Loans and Leases, Disaggregated by Loan Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Average balance with related allowance | $ 18,643 | $ 9,754 | $ 21,248 | $ 9,771
Interest income with related allowance | 33 | 176 | 103 | 222
Other Financing Receivables [Member] |  |  |  |
Interest income with no related allowance | 0 | 0 | 0 |
Construction And Land Development Loans [Member] |  |  |  |
Average balance with no related allowance | 762 | 269 | 765 | 271
Interest income with no related allowance | 0 | 18 | 0 | 24
Commercial and Industrial Sector [Member] |  |  |  |
Average balance with no related allowance | 1,782 | 0 | 1,819 | 0
Interest income with no related allowance | 7 | 0 | 24 | 0
Average balance with related allowance | 433 | 0 | 482 | 0
Interest income with related allowance | 0 | 0 | 0 | 0
Commercial Real Estate [Member] |  |  |  |
Average balance with no related allowance | 2,679 | 2,552 | 2,689 | 2,560
Interest income with no related allowance | 25 | 152 | 77 | 169
Average balance with related allowance | 0 | 894 | 0 | 895
Interest income with related allowance | 0 | 0 | 0 | 0
Residential Mortgage [Member] |  |  |  |
Average balance with no related allowance | 2,916 | 906 | 2,755 | 907
Interest income with no related allowance | 0 | 3 | 0 | 25
Small Business Administration Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Average balance with no related allowance | 10,017 | 3,005 | 12,682 | 3,007
Interest income with no related allowance | 0 | 3 | 0 | 4
Average balance with related allowance | 39 | 2,128 | 41 | 2,131
Interest income with related allowance | 1 |  | 2 |
Other Financing Receivables [Member] |  |  |  |
Average balance with no related allowance | $ 15 | $ 0 | $ 15 | $ 0

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- Definition Amount of average investment of impaired financing receivables for which there is no 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 17 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524 Reference 2: 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=121611835&loc=d3e5212-111524 + Details
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- Definition Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no 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)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
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