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Loans and ALLL (Summary of recorded investment in loans by segments) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment, ALLL | $ 950 |  | $ 1,114 |  |  |
Collectively evaluated for impairment, ALLL | 7,927 |  | 6,825 |  |  |
Total, ALLL | 8,877 | $ 8,697 | 7,939 | $ 8,037 | $ 8,398 | $ 8,375
Individually evaluated for impairment, Loans | 26,352 |  | 28,191 |  |  |
Collectively evaluated for impairment, Loans | 1,258,033 |  | 1,158,379 |  |  |
Total | 1,284,385 |  | 1,186,570 |  |  |
Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment, ALLL | 63 |  | 15 |  |  |
Collectively evaluated for impairment, ALLL | 2,058 |  | 1,899 |  |  |
Total, ALLL | 2,121 | 2,375 | 1,914 | 2,080 | 2,248 | 2,563
Individually evaluated for impairment, Loans | 8,235 |  | 7,865 |  |  |
Collectively evaluated for impairment, Loans | 791,397 |  | 693,076 |  |  |
Total | 799,632 |  | 700,941 |  |  |
Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment, ALLL | 63 |  | 26 |  |  |
Collectively evaluated for impairment, ALLL | 293 |  | 608 |  |  |
Total, ALLL | 356 | 490 | 634 | 612 | 775 | 775
Individually evaluated for impairment, Loans | 13,191 |  | 14,840 |  |  |
Collectively evaluated for impairment, Loans | 89,971 |  | 102,080 |  |  |
Total | 103,162 |  | 116,920 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment, ALLL | 824 |  | 1,073 |  |  |
Collectively evaluated for impairment, ALLL | 369 |  | 974 |  |  |
Total, ALLL | 1,193 | 1,717 | 2,047 | 1,882 | 2,305 | 1,992
Individually evaluated for impairment, Loans | 4,926 |  | 5,486 |  |  |
Collectively evaluated for impairment, Loans | 303,000 |  | 293,083 |  |  |
Total | 307,926 |  | 298,569 |  |  |
Total Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment, ALLL | 0 |  | 0 |  |  |
Collectively evaluated for impairment, ALLL | 825 |  | 922 |  |  |
Total, ALLL | 825 | 961 | 922 | 927 | 891 | 857
Individually evaluated for impairment, Loans | 0 |  | 0 |  |  |
Collectively evaluated for impairment, Loans | 73,665 |  | 70,140 |  |  |
Total | 73,665 |  | 70,140 |  |  |
Unallocated [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated for impairment, ALLL | 0 |  | 0 |  |  |
Collectively evaluated for impairment, ALLL | 4,382 |  | 2,422 |  |  |
Total, ALLL | $ 4,382 | $ 3,154 | $ 2,422 | $ 2,536 | $ 2,179 | $ 2,188

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