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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