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Note 8 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans with no related allowance, unpaid principal balance | $ 57,066 | $ 41,315
Loans with no related allowance, recorded investment | 52,720 | 35,540
Loans with related allowance, unpaid principal balance | 36,754 | 41,626
Loans with related allowance, recorded investment | 35,377 | 40,319
Allowance | 3,451 | 3,236
Total impaired loans, unpaid principal balance | 93,820 | 82,941
Total impaired loans, recorded investment | 88,097 | 75,859
Commercial Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 28,685 | 20,134
Loans with no related allowance, recorded investment | 25,991 | 15,857
Loans with related allowance, unpaid principal balance | 9,223 | 8,769
Loans with related allowance, recorded investment | 9,152 | 8,739
Allowance | 2,827 | 2,543
Real Estate Construction Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 5,776 | 5,776
Loans with no related allowance, recorded investment | 4,482 | 4,580
Commercial Real Estate Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 16,559 | 9,234
Loans with no related allowance, recorded investment | 16,223 | 9,030
Loans with related allowance, unpaid principal balance | 20,513 | 26,117
Loans with related allowance, recorded investment | 20,420 | 26,040
Allowance | 405 | 473
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 6,046 | 6,171
Loans with no related allowance, recorded investment | 6,024 | 6,073
Loans with related allowance, unpaid principal balance | 7,018 | 6,740
Loans with related allowance, recorded investment | 5,805 | 5,540
Allowance | $ 219 | $ 220

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- Definition 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details
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