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Note 8 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing receivable, recorded investment, past due |  | $ 6,309 | $ 7,866
Financing receivable, recorded investment, current |  | 1,170,790 | 1,052,980
Loans receivable |  | 1,177,099 | 1,060,846
Financing receivable, recorded investment, 90 days past due and still accruing |  | 180 | 255
Construction Real Estate [Member] |  |  |
Financing receivable, recorded investment, past due |  | 191 | 1,796
Financing receivable, recorded investment, current |  | 45,330 | 46,099
Loans receivable |  | 45,521 | 47,895
Financing receivable, recorded investment, 90 days past due and still accruing |  | 0 | 0
Family Residential Real Estate 1-4 [Member] |  |  |
Financing receivable, recorded investment, past due |  | 1,148 | 1,101
Financing receivable, recorded investment, current |  | 210,091 | 200,409
Loans receivable |  | 211,239 | 201,510
Financing receivable, recorded investment, 90 days past due and still accruing |  | 131 | 188
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing receivable, recorded investment, past due |  | 251 | 387
Financing receivable, recorded investment, current |  | 491,148 | 435,463
Loans receivable |  | 491,399 | 435,850
Financing receivable, recorded investment, 90 days past due and still accruing |  | 0 | 0
Agriculture Real Estate [Member] |  |  |
Financing receivable, recorded investment, past due |  | 2,849 | 422
Financing receivable, recorded investment, current |  | 154,646 | 160,349
Loans receivable |  | 157,495 | 160,771
Financing receivable, recorded investment, 90 days past due and still accruing |  | 33 | 0
Commercial Portfolio Segment [Member] |  |  |
Financing receivable, recorded investment, past due |  | 751 | 755
Financing receivable, recorded investment, current |  | 151,956 | 83,329
Loans receivable | [1] | 152,707 | 84,084
Financing receivable, recorded investment, 90 days past due and still accruing |  | 0 | 0
Agriculture [Member] |  |  |
Financing receivable, recorded investment, past due |  | 1,046 | 3,253
Financing receivable, recorded investment, current |  | 101,153 | 108,692
Loans receivable |  | 102,199 | 111,945
Financing receivable, recorded investment, 90 days past due and still accruing |  | 0 | 62
Consumer and Other [Member] |  |  |
Financing receivable, recorded investment, past due |  | 73 | 152
Financing receivable, recorded investment, current |  | 16,466 | 18,639
Loans receivable |  | 16,539 | 18,791
Financing receivable, recorded investment, 90 days past due and still accruing |  | 16 | 5
Financing Receivables 30 to 89 Days Past Due [Member] |  |  |
Financing receivable, recorded investment, past due |  | 2,694 | 4,746
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member] |  |  |
Financing receivable, recorded investment, past due |  | 26 | 1,796
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member] |  |  |
Financing receivable, recorded investment, past due |  | 763 | 811
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing receivable, recorded investment, past due |  | 176 | 387
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member] |  |  |
Financing receivable, recorded investment, past due |  | 1,014 | 422
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing receivable, recorded investment, past due |  | 104 | 518
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member] |  |  |
Financing receivable, recorded investment, past due |  | 574 | 666
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member] |  |  |
Financing receivable, recorded investment, past due |  | 37 | 146
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing receivable, recorded investment, past due |  | 3,615 | 3,120
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member] |  |  |
Financing receivable, recorded investment, past due |  | 165 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member] |  |  |
Financing receivable, recorded investment, past due |  | 385 | 290
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing receivable, recorded investment, past due |  | 75 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture Real Estate [Member] |  |  |
Financing receivable, recorded investment, past due |  | 1,835 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing receivable, recorded investment, past due |  | 647 | 237
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member] |  |  |
Financing receivable, recorded investment, past due |  | 472 | 2,587
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member] |  |  |
Financing receivable, recorded investment, past due |  | $ 36 | $ 6
[1] | Commercial loan portfolio as of September 30, 2020 includes $79.6 million Payroll Protection Program ("PPP") loans

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