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Note 8 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Unpaid principal - with no allowance | $ 2,139 | $ 4,952
Recorded investment - with no allowance | 2,111 | 4,923
Unpaid principal - with allowance | 3,375 | 4,851
Recorded investment - with allowance | 3,375 | 4,851
Related allowance | 1,051 | 1,605
Unpaid principal | 5,514 | 9,803
Recorded investment | 5,486 | 9,774
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member] |  |
Unpaid principal - with no allowance | 645 | 750
Recorded investment - with no allowance | 617 | 721
Unpaid principal - with allowance | 406 | 270
Recorded investment - with allowance | 406 | 270
Related allowance | 0 | 0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member] |  |
Unpaid principal - with no allowance | 42 | 54
Recorded investment - with no allowance | 42 | 54
Unpaid principal - with allowance | 326 | 239
Recorded investment - with allowance | 326 | 239
Related allowance | 176 | 116
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Unpaid principal - with no allowance | 684 | 1,787
Recorded investment - with no allowance | 684 | 1,787
Unpaid principal - with allowance | 0 | 2,515
Recorded investment - with allowance | 0 | 2,515
Related allowance | 0 | 781
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |
Unpaid principal - with no allowance | 563 | 817
Recorded investment - with no allowance | 563 | 817
Unpaid principal - with allowance | 904 | 1,340
Recorded investment - with allowance | 904 | 1,340
Related allowance | 149 | 659
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member] |  |
Unpaid principal - with no allowance | 129 | 862
Recorded investment - with no allowance | 129 | 862
Unpaid principal - with allowance | 478 | 487
Recorded investment - with allowance | 478 | 487
Related allowance | 48 | 49
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |
Unpaid principal - with no allowance | 76 | 665
Recorded investment - with no allowance | 76 | 665
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |
Unpaid principal - with allowance | 1,261 | 0
Recorded investment - with allowance | 1,261 | 0
Related allowance | 678 | 0
Consumer Portfolio Segment [Member] |  |
Unpaid principal - with no allowance | 0 | 17
Recorded investment - with no allowance | $ 0 | $ 17

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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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