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Loans and ALLL (Credit quality indicators for commercial and agricultural credit exposures) (Details) - USD ($) | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | $ 1,264,173,000 |  |
Individually evaluated for impairment, ALLL |  | 451,000 |  |
Collectively evaluated for impairment, ALLL |  | 9,399,000 |  |
Financing Receivable, Allowance for Credit Loss | $ 12,640,000 | 9,850,000 | $ 9,204,000 | $ 9,103,000
Financing Receivable, Individually Evaluated for Impairment |  | 22,018,000 |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 1,242,155,000 |  |
Collateral Pledged |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Individually evaluated for impairment, ALLL | 0 | 451,000 |  |
Financing Receivable, Individually Evaluated for Impairment | 280,000 | 22,018,000 |  |
Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 744,440,000 |  |
Financing Receivable, Allowance for Credit Loss | 817,000 | 860,000 | 1,245,000 | 1,740,000
Total commercial [Member] | Collateral Pledged |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Individually evaluated for impairment, ALLL | 0 | 0 |  |
Financing Receivable, Individually Evaluated for Impairment | 0 | 0 |  |
Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 566,012,000 |  |
Commercial real estate [Member] | Collateral Pledged |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | 8,342,000 |  |
Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 104,985,000 |  |
Collectively evaluated for impairment, ALLL |  | 577,000 |  |
Financing Receivable, Allowance for Credit Loss | 265,000 | 577,000 | $ 383,000 | $ 289,000
Financing Receivable, Collectively Evaluated for Impairment |  | 94,050,000 |  |
Total agricultural [Member] | Collateral Pledged |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Individually evaluated for impairment, ALLL | 0 | 0 |  |
Financing Receivable, Individually Evaluated for Impairment | $ 199,000 | 10,935,000 |  |
Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 73,002,000 |  |
Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 31,983,000 |  |
Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 849,425,000 |  |
Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 178,428,000 |  |
Commercial and Commercial Real Estate Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 744,440,000 |  |
Individually evaluated for impairment, ALLL |  | 12,000 |  |
Collectively evaluated for impairment, ALLL |  | 1,309,000 |  |
Financing Receivable, Allowance for Credit Loss |  | 1,321,000 |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 736,098,000 |  |
1 - Excellent [Member] | Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
1 - Excellent [Member] | Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
1 - Excellent [Member] | Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
1 - Excellent [Member] | Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
1 - Excellent [Member] | Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
1 - Excellent [Member] | Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
1 - Excellent [Member] | Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
2 - High quality [Member] | Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 13,578,000 |  |
2 - High quality [Member] | Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 9,045,000 |  |
2 - High quality [Member] | Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 442,000 |  |
2 - High quality [Member] | Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 342,000 |  |
2 - High quality [Member] | Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 100,000 |  |
2 - High quality [Member] | Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 14,020,000 |  |
2 - High quality [Member] | Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 4,533,000 |  |
3 - High satisfactory [Member] | Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 104,741,000 |  |
3 - High satisfactory [Member] | Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 68,133,000 |  |
3 - High satisfactory [Member] | Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 14,365,000 |  |
3 - High satisfactory [Member] | Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 9,757,000 |  |
3 - High satisfactory [Member] | Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 4,608,000 |  |
3 - High satisfactory [Member] | Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 119,106,000 |  |
3 - High satisfactory [Member] | Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 36,608,000 |  |
4 - Low satisfactory [Member] | Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 589,094,000 |  |
4 - Low satisfactory [Member] | Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 462,361,000 |  |
4 - Low satisfactory [Member] | Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 65,472,000 |  |
4 - Low satisfactory [Member] | Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 44,258,000 |  |
4 - Low satisfactory [Member] | Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 21,214,000 |  |
4 - Low satisfactory [Member] | Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 654,566,000 |  |
4 - Low satisfactory [Member] | Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 126,733,000 |  |
5 - Special mention [Member] | Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 28,217,000 |  |
5 - Special mention [Member] | Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 20,770,000 |  |
5 - Special mention [Member] | Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 16,896,000 |  |
5 - Special mention [Member] | Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 12,262,000 |  |
5 - Special mention [Member] | Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 4,634,000 |  |
5 - Special mention [Member] | Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 45,113,000 |  |
5 - Special mention [Member] | Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 7,447,000 |  |
6 - Substandard [Member] | Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 8,714,000 |  |
6 - Substandard [Member] | Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 5,629,000 |  |
6 - Substandard [Member] | Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 7,576,000 |  |
6 - Substandard [Member] | Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 6,316,000 |  |
6 - Substandard [Member] | Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 1,260,000 |  |
6 - Substandard [Member] | Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 16,290,000 |  |
6 - Substandard [Member] | Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 3,085,000 |  |
7 - Vulnerable [Member] | Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 96,000 |  |
7 - Vulnerable [Member] | Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 74,000 |  |
7 - Vulnerable [Member] | Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 234,000 |  |
7 - Vulnerable [Member] | Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 67,000 |  |
7 - Vulnerable [Member] | Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 167,000 |  |
7 - Vulnerable [Member] | Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 330,000 |  |
7 - Vulnerable [Member] | Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 22,000 |  |
8 - Doubtful [Member] | Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
8 - Doubtful [Member] | Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
8 - Doubtful [Member] | Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
8 - Doubtful [Member] | Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
8 - Doubtful [Member] | Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
8 - Doubtful [Member] | Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
8 - Doubtful [Member] | Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
9 - Loss | Total commercial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
9 - Loss | Commercial real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
9 - Loss | Total agricultural [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
9 - Loss | Agricultural real estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
9 - Loss | Agricultural other [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
9 - Loss | Commercial And Agricultural Portfolio Segment [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | 0 |  |
9 - Loss | Commercial and Industrial Portfolio Segment |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
Total |  | $ 0 |  |

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