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Note 4 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loans with no related allowance, unpaid principal balance | $ 41,315 | $ 77,605
Loans with no related allowance, recorded investment | 35,540 | 65,315
Loans with related allowance, unpaid principal balance | 41,626 | 42,686
Loans with related allowance, recorded investment | 40,319 | 41,571
Allowance | 3,236 | 3,802
Total impaired loans, unpaid principal balance | 82,941 | 120,291
Total impaired loans, recorded investment | 75,859 | 106,886
Commercial Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 20,134 | 32,015
Loans with no related allowance, recorded investment | 15,857 | 30,368
Loans with related allowance, unpaid principal balance | 8,769 | 6,653
Loans with related allowance, recorded investment | 8,739 | 6,570
Allowance | 2,543 | 1,837
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 | 4,580 | 4,873
Commercial Real Estate Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 9,234 | 34,129
Loans with no related allowance, recorded investment | 9,030 | 24,409
Loans with related allowance, unpaid principal balance | 26,117 | 27,099
Loans with related allowance, recorded investment | 26,040 | 27,063
Allowance | 473 | 877
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans with no related allowance, unpaid principal balance | 6,171 | 5,685
Loans with no related allowance, recorded investment | 6,073 | 5,665
Loans with related allowance, unpaid principal balance | 6,740 | 8,934
Loans with related allowance, recorded investment | 5,540 | 7,938
Allowance | $ 220 | $ 1,088

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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=118936363&loc=SL6953550-111524 + Details
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